---
title: "Grow Room AC Sizing (BTU): Why Your LED Setup Needs as Much Cooling as HPS"
canonical: "https://theyieldgrid.com/grow-room-ac-sizing-btu/"
model_id: "tyg-735"
model_version: "1.0.0"
last_reviewed: "2026-08-20T10:17:19"
reviewed_by: "Umer Hayiat"
---

# Grow Room AC Sizing (BTU): Why Your LED Setup Needs as Much Cooling as HPS

> Canonical calculator: [https://theyieldgrid.com/grow-room-ac-sizing-btu/](https://theyieldgrid.com/grow-room-ac-sizing-btu/)

## What this calculator does

Home - Free Gardening Calculators & Tools - Grow Room AC Sizing (BTU): Why Your LED Setup Needs as Much Cooling as HPS Every watt of electricity consumed inside a sealed grow room converts to heat. Luminaries, dehumidifiers, circulation pumps, controllers: the moment power flows, thermal load begins accumulating. The sizing question is not "how hot does the light feel?" but rather "how many BTU per hour does my equipment deposit into this air volume, and what is the net conductive gain through the walls?" Those two figures, added together, define the minimum cooling capacity that must be removed continuously while lights are on.

## Inputs

| Input | ID | Type | Unit | Range or choices | Required |
|---|---|---|---|---|---|
| Total LED Light Wattage | `ledhvac_led_watts` | number |  | 0 to 100000 | Yes |
| Total Dehumidifier Wattage | `ledhvac_dehum_watts` | number |  | 0 to 100000 | Yes |
| Room Length × Width × Height (ft) | `ledhvac_room_l` | number | ft | 1 to 10000 | Yes |
| Room width in feet | `ledhvac_room_w` | number | feet | 1 to 10000 | Yes |
| Room height in feet | `ledhvac_room_h` | number | feet | 1 to 100 | Yes |
| Room Insulation R-Value | `ledhvac_rvalue` | number |  | 1 to 60 | Yes |
| Inside/Outside Temperature Difference (ΔT, °F) | `ledhvac_delta_t` | number | ΔT, °F | 0 to 100 | Yes |

## Outputs

| Output ID | Default state |
|---|---|
| `ledhvac_results` | Your Cooling Load Results BTU/hr AC Sizing Scale (BTU/hr) 0 Mini-split range (6k–24k) Commercial (>60k) LED Lights (BTU/hr) Dehumidifier (BTU/hr) Envelope Gain (BTU/hr) Warnings & Standards ✓ System Checks Passed Reference: Common Grow Room Sizing LED Watts BTU/hr (Lights Only) Min. AC Tons Typical Mini-Split How This Calculator Works Step-by-Step Formula 1. LED Heat Load: BTU_Lights = Watts_LED × 3.412 Every watt of electricity becomes heat (thermodynamic law). 3.412 BTU = 1 Watt-hour. 2. Dehum |
| `ledhvac_out_primary` |  |
| `ledhvac_out_led_btu` |  |
| `ledhvac_out_dehum_btu` |  |
| `ledhvac_out_env_btu` |  |

## Formula and method

1. LED Heat Load: BTU_Lights = Watts_LED × 3.412 Every watt of electricity becomes heat (thermodynamic law). 3.412 BTU = 1 Watt-hour. 2. Dehumidifier Heat Load: BTU_Dehum = Watts_Dehum × 3.412 Dehumidifiers run as heat pumps but still add sensible heat to the room. 3. Envelope (Wall/Roof) Conductive Gain: BTU_Envelope = (Surface_Area_ft² × ΔT_°F) ÷ R-Value Surface area = 2(LW + LH + WH). Heat flows through walls at a rate determined by ΔT and insulation. 4. Total Cooling Load: Total_BTU/hr = BTU_Lights + BTU_Dehum + BTU_Envelope 5. AC Tonnage: Tons = Total_BTU ÷ 12,000 1 ton of refrigeration = 12,000 BTU/hr. Add 10–15% safety buffer for equipment cycling. Our calculator accounts for every thermal variable, including equipment heat and the insulating properties of your room walls. Show the calculation steps Step 1: LED Heat Load BTU_Lights = Watts_LED x 3.412 The factor 3.412 is the exact conversion between watt-hours and British Thermal Units. One watt of electrical power, operated for one hour, produces 3.412 BTU of heat. This conversion applies regardless of fixture technology. A 1,000W LED fixture releases 3,412 BTU/hr of heat into the space, identical to a 1,000W HPS fixture at the same draw. The distribution differs (LED heat rises convectively toward the ceiling; HPS radiates downward toward the canopy) but the thermal magnitude is the same. Step 2: Dehumidifier Heat Load BTU_Dehum = Watts_Dehum x 3.412 Dehumidifiers operate on a refrigerant cycle: they cool a coil to condense moisture, then the condenser coil rejects heat back into the room. The net result is that nearly all electrical energy consumed by the dehumidifier ends up as sensible heat in the room air. This term is routinely omitted from online guides; omitting a 1,000W dehumidifier understates the cooling load by 3,412 BTU/hr. Step 3: Envelope (Wall and Ceiling) Conductive Gain Surface Area = 2 x (L x W + L x H + W x H) BTU_Envelope = (Surface_Area x Delta-T) / R-Value Heat conducts through walls, ceiling, and floor at a rate proportional to the temperature difference across the envelope and inversely proportional to insulation resistance. Using total six-sided surface area assumes uniform insulation across all surfaces, which is a conservative simplification. Higher R-value produces a smaller envelope gain term; lower R-value amplifies it, particularly in hot climates with large Delta-T values. Step 4: Total Cooling Load and Tonnage Total_BTU/hr = BTU_Lights + BTU_Dehum + BTU_Envelope Tons = Total_BTU / 12,000 One ton of refrigeration capacity equals 12,000 BTU/hr of heat removal. The tool also displays a 12% buffered tonnage to account for equipment derating at high ambient temperatures and duty-cycle limits on compressors during continuous operation. Rounding Rules All intermediate values are computed in full floating-point precision. The displayed BTU outputs are rounded to the nearest whole number. Tonnage is displayed to two decimal places. No rounding occurs until the final display step. Assumptions and Limits The tool models sensible (dry-bulb) heat only. Latent load from plant transpiration, which can be substantial in a fully canopied room, is not included. Envelope calculation assumes a uniform single R-value across all six surfaces. Real rooms often have different R-values for ceiling, walls, and floor; using the lowest common value produces the most conservative (safest) estimate. Air infiltration through exhaust fan openings, passive intake vents, door gaps, and CO2 injection ports is not modeled. Any unconditioned air exchange adds both sensible and latent load. Solar radiation through glazing or translucent panels is not included. Greenhouses and rooms with skylights will have materially higher loads than this tool reports. Equipment efficiency derating at high ambient conditions is not applied. Most mini-splits lose rated capacity when outdoor ambient exceeds 95 to 100 degrees F. The calculation assumes lights-on continuous operation. If lights follow a photoperiod, actual daily average load is lower; however, AC must be sized for peak load during the lights-on window. LED photon efficiency (PPE) means a small fraction of power leaves the room as light energy that is absorbed by plants rather than converted to room heat. This effect is small relative to total load and is conservatively excluded; the tool treats 100% of wattage as heat. Input ranges are enforced: LED and dehumidifier wattage 0 to 100,000 W; room dimensions 1 to 10,000 ft; R-Value 1 to 60; Delta-T 0 to 100 degrees F. Values outside these ranges trigger inline errors and block calculation.

## Verified worked examples

### Scenario 1: Small Hobbyist Tent (4 x 4 x 8 ft, 600W LED)

LED wattage: 600 W Dehumidifier wattage: 400 W Room dimensions: 4 ft x 4 ft x 8 ft (surface area: 160 sq ft) R-Value: 13 (standard insulated wall assumption) Delta-T: 15 degrees F (e.g., 90 degrees F outside, 75 degrees F target) Result: BTU_LED = 2,047 | BTU_Dehum = 1,365 | BTU_Envelope = 185 | Total = 3,597 BTU/hr | 0.30 tons A 9,000 BTU/hr mini-split provides substantial headroom for this setup. The dehumidifier contributes nearly as much heat as the LED fixture, which is why eliminating it from the calculation produces a dangerously undersized result.

### Scenario 2: Commercial Production Room (20 x 30 x 10 ft, 6,000W LED)

LED wattage: 6,000 W Dehumidifier wattage: 2,000 W Room dimensions: 20 ft x 30 ft x 10 ft (surface area: 2,200 sq ft) R-Value: 19 (spray foam or high-density batt insulation) Delta-T: 25 degrees F (e.g., 100 degrees F outside, 75 degrees F target) Result: BTU_LED = 20,472 | BTU_Dehum = 6,824 | BTU_Envelope = 2,895 | Total = 30,191 BTU/hr | 2.52 tons This room requires at minimum a 2.5-ton system. Two 18,000 BTU/hr mini-splits would cover it; a single 36,000 BTU/hr unit is the more practical solution. Note that envelope gain is less than 10% of total load thanks to R-19 insulation and modest Delta-T.

### Scenario 3: Mid-Size Dedicated Grow Room (10 x 12 x 9 ft, 3,000W LED,

Poor Insulation) LED wattage: 3,000 W Dehumidifier wattage: 1,000 W Room dimensions: 10 ft x 12 ft x 9 ft (surface area: 636 sq ft) R-Value: 11 (partially insulated or thin batt insulation) Delta-T: 30 degrees F (hot climate or unshaded exterior wall exposure) Result: BTU_LED = 10,236 | BTU_Dehum = 3,412 | BTU_Envelope = 1,735 | Total = 15,383 BTU/hr | 1.28 tons An 18,000 BTU/hr (1.5-ton) mini-split covers this load with reasonable buffer. Upgrading insulation from R-11 to R-19 would reduce envelope gain by more than half, extending equipment life and reducing operating hours at peak load.

## Assumptions

All wattage inputs are in Watts (W) Dimensions in feet (ft); ΔT in °F Envelope calculation uses total 6-sided surface area (assumes uniform insulation) Does not account for infiltration, occupant loads, or latent humidity loads Assumes single ΔT for entire envelope (conservative, real design may vary) LED heat is 100% sensible (convective); no radiant fraction modeled Our calculator accounts for every thermal variable, including equipment heat and the insulating properties of your room walls. Show the calculation steps Step 1: LED Heat Load BTU_Lights = Watts_LED x 3.412 The factor 3.412 is the exact conversion between watt-hours and British Thermal Units. One watt of electrical power, operated for one hour, produces 3.412 BTU of heat. This conversion applies regardless of fixture technology. A 1,000W LED fixture releases 3,412 BTU/hr of heat into the space, identical to a 1,000W HPS fixture at the same draw. The distribution differs (LED heat rises convectively toward the ceiling; HPS radiates downward toward the canopy) but the thermal magnitude is the same. Step 2: Dehumidifier Heat Load BTU_Dehum = Watts_Dehum x 3.412 Dehumidifiers operate on a refrigerant cycle: they cool a coil to condense moisture, then the condenser coil rejects heat back into the room. The net result is that nearly all electrical energy consumed by the dehumidifier ends up as sensible heat in the room air. This term is routinely omitted from online guides; omitting a 1,000W dehumidifier understates the cooling load by 3,412 BTU/hr. Step 3: Envelope (Wall and Ceiling) Conductive Gain Surface Area = 2 x (L x W + L x H + W x H) BTU_Envelope = (Surface_Area x Delta-T) / R-Value Heat conducts through walls, ceiling, and floor at a rate proportional to the temperature difference across the envelope and inversely proportional to insulation resistance. Using total six-sided surface area assumes uniform insulation across all surfaces, which is a conservative simplification. Higher R-value produces a smaller envelope gain term; lower R-value amplifies it, particularly in hot climates with large Delta-T values. Step 4: Total Cooling Load and Tonnage Total_BTU/hr = BTU_Lights + BTU_Dehum + BTU_Envelope Tons = Total_BTU / 12,000 One ton of refrigeration capacity equals 12,000 BTU/hr of heat removal. The tool also displays a 12% buffered tonnage to account for equipment derating at high ambient temperatures and duty-cycle limits on compressors during continuous operation. Rounding Rules All intermediate values are computed in full floating-point precision. The displayed BTU outputs are rounded to the nearest whole number. Tonnage is displayed to two decimal places. No rounding occurs until the final display step. Assumptions and Limits The tool models sensible (dry-bulb) heat only. Latent load from plant transpiration, which can be substantial in a fully canopied room, is not included. Envelope calculation assumes a uniform single R-value across all six surfaces. Real rooms often have different R-values for ceiling, walls, and floor; using the lowest common value produces the most conservative (safest) estimate. Air infiltration through exhaust fan openings, passive intake vents, door gaps, and CO2 injection ports is not modeled. Any unconditioned air exchange adds both sensible and latent load. Solar radiation through glazing or translucent panels is not included. Greenhouses and rooms with skylights will have materially higher loads than this tool reports. Equipment efficiency derating at high ambient conditions is not applied. Most mini-splits lose rated capacity when outdoor ambient exceeds 95 to 100 degrees F. The calculation assumes lights-on continuous operation. If lights follow a photoperiod, actual daily average load is lower; however, AC must be sized for peak load during the lights-on window. LED photon efficiency (PPE) means a small fraction of power leaves the room as light energy that is absorbed by plants rather than converted to room heat. This effect is small relative to total load and is conservatively excluded; the tool treats 100% of wattage as heat. Input ranges are enforced: LED and dehumidifier wattage 0 to 100,000 W; room dimensions 1 to 10,000 ft; R-Value 1 to 60; Delta-T 0 to 100 degrees F. Values outside these ranges trigger inline errors and block calculation. The tool models sensible (dry-bulb) heat only. Latent load from plant transpiration, which can be substantial in a fully canopied room, is not included. Envelope calculation assumes a uniform single R-value across all six surfaces. Real rooms often have different R-values for ceiling, walls, and floor; using the lowest common value produces the most conservative (safest) estimate. Air infiltration through exhaust fan openings, passive intake vents, door gaps, and CO2 injection ports is not modeled. Any unconditioned air exchange adds both sensible and latent load. Solar radiation through glazing or translucent panels is not included. Greenhouses and rooms with skylights will have materially higher loads than this tool reports. Equipment efficiency derating at high ambient conditions is not applied. Most mini-splits lose rated capacity when outdoor ambient exceeds 95 to 100 degrees F. The calculation assumes lights-on continuous operation. If lights follow a photoperiod, actual daily average load is lower; however, AC must be sized for peak load during the lights-on window. LED photon efficiency (PPE) means a small fraction of power leaves the room as light energy that is absorbed by plants rather than converted to room heat. This effect is small relative to total load and is conservatively excluded; the tool treats 100% of wattage as heat. Input ranges are enforced: LED and dehumidifier wattage 0 to 100,000 W; room dimensions 1 to 10,000 ft; R-Value 1 to 60; Delta-T 0 to 100 degrees F. Values outside these ranges trigger inline errors and block calculation. Critical Warnings A watt is a watt, technology does not change thermodynamics: Switching from HPS to LED at the same wattage does not reduce thermal load. The grow room still requires the same AC capacity. Growers who remove cooling equipment after an LED upgrade based on marketing language about "running cooler" risk crop-threatening temperature spikes. Omitting dehumidifier wattage produces a dangerously understated result: In a typical 3,000W LED room, a 1,000W dehumidifier adds 3,412 BTU/hr to the cooling load. That omission represents roughly one-quarter of the LED heat load itself. Always enter the dehumidifier's electrical draw, not its pint-per-day removal rating. Using average ambient temperature instead of design-day peak creates systematic undersizing: AC equipment must handle the worst-case steady-state load, which occurs on the hottest afternoon of the hottest week. Basing Delta-T on seasonal averages produces a unit that keeps pace most of the time but fails precisely when failure is most costly. Ignoring insulation quality in a hot or cold climate compounds every other error: At R-4 (uninsulated wall) versus R-19, the envelope gain term quadruples for the same room size and Delta-T. Retroactively improving insulation is far more cost-effective than upgrading to a larger AC unit. Minimum Standards ASHRAE recommends selecting cooling equipment at or above the calculated design load; never size below it. A buffer of 10 to 15% above calculated load is standard practice to account for equipment tolerance and thermal mass cycling. Mini-split systems rated in BTU/hr should be selected so that their nominal cooling output at the expected outdoor ambient temperature meets or exceeds the calculated total. Check the manufacturer's capacity table at your design outdoor temperature, not just the nameplate BTU figure. For rooms requiring more than 36,000 BTU/hr (3 tons), multi-zone mini-split systems or commercial packaged HVAC units are appropriate. DIY single-zone mini-splits top out near 36,000 BTU/hr; beyond that, consult a licensed HVAC engineer for equipment selection and refrigerant line sizing. Competitor Trap: Most "grow room BTU calculator" pages on the web calculate LED heat load only and ignore dehumidifiers, auxiliary pumps, and envelope gain. They also base the formula on HPS-era rules of thumb ("600W HPS needs 12,000 BTU") without deriving from the actual electrical-to-thermal conversion. A grower using one of those calculators in a poorly insulated room with a large dehumidifier will systematically undersize their AC; in rooms where the dehumidifier draw equals a third or more of LED wattage, the omitted load alone exceeds one ton of required cooling capacity. The predictable outcome is a room that holds temperature on mild nights and climbs uncontrollably during afternoon peak hours. Sizing with a complete load calculation, as this tool performs, eliminates that systematic error. Climate management does not stop at cooling. If your room needs supplemental heat during a cold-weather dark period, the companion greenhouse heater size calculator uses the same envelope and Delta-T logic in reverse to size heating equipment. Separately, maintaining precise vapor pressure deficit alongside temperature is handled by the VPD calculator , which translates temperature and relative humidity into actionable plant-stress targets once your AC has stabilized the thermal environment. ASHRAE recommends selecting cooling equipment at or above the calculated design load; never size below it. A buffer of 10 to 15% above calculated load is standard practice to account for equipment tolerance and thermal mass cycling. Mini-split systems rated in BTU/hr should be selected so that their nominal cooling output at the expected outdoor ambient temperature meets or exceeds the calculated total. Check the manufacturer's capacity table at your design outdoor temperature, not just the nameplate BTU figure. For rooms requiring more than 36,000 BTU/hr (3 tons), multi-zone mini-split systems or commercial packaged HVAC units are appropriate. DIY single-zone mini-splits top out near 36,000 BTU/hr; beyond that, consult a licensed HVAC engineer for equipment selection and refrigerant line sizing. Competitor Trap: Most "grow room BTU calculator" pages on the web calculate LED heat load only and ignore dehumidifiers, auxiliary pumps, and envelope gain. They also base the formula on HPS-era rules of thumb ("600W HPS needs 12,000 BTU") without deriving from the actual electrical-to-thermal conversion. A grower using one of those calculators in a poorly insulated room with a large dehumidifier will systematically undersize their AC; in rooms where the dehumidifier draw equals a third or more of LED wattage, the omitted load alone exceeds one ton of required cooling capacity. The predictable outcome is a room that holds temperature on mild nights and climbs uncontrollably during afternoon peak hours. Sizing with a complete load calculation, as this tool performs, eliminates that systematic error. Climate management does not stop at cooling. If your room needs supplemental heat during a cold-weather dark period, the companion greenhouse heater size calculator uses the same envelope and Delta-T logic in reverse to size heating equipment. Separately, maintaining precise vapor pressure deficit alongside temperature is handled by the VPD calculator , which translates temperature and relative humidity into actionable plant-stress targets once your AC has stabilized the thermal environment.

## Limitations and safety

Does not model solar gain through windows or skylights Does not account for air infiltration (gaps, exhaust fans, CO&sub2; injection) Does not separate ceiling/wall/floor R-values Does not model latent (humidity) loads from plant transpiration LED fixture photon efficiency (PPE) reduces heat output slightly vs. raw watts — tool uses conservative 100% electrical = heat The tool models sensible (dry-bulb) heat only. Latent load from plant transpiration, which can be substantial in a fully canopied room, is not included. Envelope calculation assumes a uniform single R-value across all six surfaces. Real rooms often have different R-values for ceiling, walls, and floor; using the lowest common value produces the most conservative (safest) estimate. Air infiltration through exhaust fan openings, passive intake vents, door gaps, and CO2 injection ports is not modeled. Any unconditioned air exchange adds both sensible and latent load. Solar radiation through glazing or translucent panels is not included. Greenhouses and rooms with skylights will have materially higher loads than this tool reports. Equipment efficiency derating at high ambient conditions is not applied. Most mini-splits lose rated capacity when outdoor ambient exceeds 95 to 100 degrees F. The calculation assumes lights-on continuous operation. If lights follow a photoperiod, actual daily average load is lower; however, AC must be sized for peak load during the lights-on window. LED photon efficiency (PPE) means a small fraction of power leaves the room as light energy that is absorbed by plants rather than converted to room heat. This effect is small relative to total load and is conservatively excluded; the tool treats 100% of wattage as heat. Input ranges are enforced: LED and dehumidifier wattage 0 to 100,000 W; room dimensions 1 to 10,000 ft; R-Value 1 to 60; Delta-T 0 to 100 degrees F. Values outside these ranges trigger inline errors and block calculation. Critical Warnings A watt is a watt, technology does not change thermodynamics: Switching from HPS to LED at the same wattage does not reduce thermal load. The grow room still requires the same AC capacity. Growers who remove cooling equipment after an LED upgrade based on marketing language about "running cooler" risk crop-threatening temperature spikes. Omitting dehumidifier wattage produces a dangerously understated result: In a typical 3,000W LED room, a 1,000W dehumidifier adds 3,412 BTU/hr to the cooling load. That omission represents roughly one-quarter of the LED heat load itself. Always enter the dehumidifier's electrical draw, not its pint-per-day removal rating. Using average ambient temperature instead of design-day peak creates systematic undersizing: AC equipment must handle the worst-case steady-state load, which occurs on the hottest afternoon of the hottest week. Basing Delta-T on seasonal averages produces a unit that keeps pace most of the time but fails precisely when failure is most costly. Ignoring insulation quality in a hot or cold climate compounds every other error: At R-4 (uninsulated wall) versus R-19, the envelope gain term quadruples for the same room size and Delta-T. Retroactively improving insulation is far more cost-effective than upgrading to a larger AC unit. Minimum Standards ASHRAE recommends selecting cooling equipment at or above the calculated design load; never size below it. A buffer of 10 to 15% above calculated load is standard practice to account for equipment tolerance and thermal mass cycling. Mini-split systems rated in BTU/hr should be selected so that their nominal cooling output at the expected outdoor ambient temperature meets or exceeds the calculated total. Check the manufacturer's capacity table at your design outdoor temperature, not just the nameplate BTU figure. For rooms requiring more than 36,000 BTU/hr (3 tons), multi-zone mini-split systems or commercial packaged HVAC units are appropriate. DIY single-zone mini-splits top out near 36,000 BTU/hr; beyond that, consult a licensed HVAC engineer for equipment selection and refrigerant line sizing. Competitor Trap: Most "grow room BTU calculator" pages on the web calculate LED heat load only and ignore dehumidifiers, auxiliary pumps, and envelope gain. They also base the formula on HPS-era rules of thumb ("600W HPS needs 12,000 BTU") without deriving from the actual electrical-to-thermal conversion. A grower using one of those calculators in a poorly insulated room with a large dehumidifier will systematically undersize their AC; in rooms where the dehumidifier draw equals a third or more of LED wattage, the omitted load alone exceeds one ton of required cooling capacity. The predictable outcome is a room that holds temperature on mild nights and climbs uncontrollably during afternoon peak hours. Sizing with a complete load calculation, as this tool performs, eliminates that systematic error. Climate management does not stop at cooling. If your room needs supplemental heat during a cold-weather dark period, the companion greenhouse heater size calculator uses the same envelope and Delta-T logic in reverse to size heating equipment. Separately, maintaining precise vapor pressure deficit alongside temperature is handled by the VPD calculator , which translates temperature and relative humidity into actionable plant-stress targets once your AC has stabilized the thermal environment. It accounts for compressor cycling losses, equipment derating at high outdoor ambient temperatures, and minor thermal mass effects not captured in the steady-state formula. Standard HVAC engineering practice suggests sizing at 110 to 115% of calculated load. The buffered figure in the output reflects a 12% margin; selecting equipment at or above the buffered tonnage value is the conservative design choice.

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## Provenance

- Model ID: `tyg-735`
- Model version: `1.0.0`
- Reviewed by: Umer Hayiat
- Page modified: 2026-08-20T10:17:19
- Runtime SHA-256: `7a0484f9ee79f5e4527150de00a9a70fda29d517f23ff1fb1af2a74a282dbbb4`

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