How Many BTUs to Cool a Kitchen? Stove Heat & Sizing Guide
Key Takeaway
A standard 200 sq ft kitchen typically needs 9,000–12,000 BTU — roughly 4,000 BTU more than a comparable bedroom due to stove and oven heat.
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Expert Analysis
Cooking Appliance Heat Gain & Range Hood Interaction
Kitchens are the most thermally complex rooms in a home because the dominant heat sources are intermittent and extremely high-intensity. A residential gas range operating all four burners simultaneously releases approximately 40,000 BTU/h of combustion heat, of which roughly 65% enters the kitchen as sensible and latent heat gain even with a functional range hood exhausting above the cooktop.
The latent heat component is particularly significant. Steam from boiling, braising, and dishwashing adds substantial moisture load that a standard comfort cooling unit with a high sensible heat ratio (SHR) handles poorly. Units with SHR values above 0.85 cool the air but leave it humid and uncomfortable during cooking.
A second challenge is the interaction between range hood exhaust and AC supply air. A 400 CFM range hood creates negative pressure that draws warm outdoor air through gaps in the building envelope, increasing the total infiltration load on the AC. In a tightly sealed kitchen, this creates a de-pressurization problem that reduces hood effectiveness.
For best results, size the AC for the non-cooking sensible base load, ensure the range hood is rated for at least 1 CFM per 100 BTU/h of burner output, and use a unit with a dedicated dehumidification mode for periods of heavy cooking.
Buying Guide
Ventilation-First Strategy: What to Look For in a Kitchen AC
Must-Have Features
High Latent Capacity / Low SHR
Cooking generates significant moisture from boiling, steaming, and dishwashing. A unit with a sensible heat ratio (SHR) below 0.80 removes more moisture per unit of cooling energy, keeping the kitchen comfortable even during heavy cooking sessions rather than just cooling the air.
Washable Grease Filter
Airborne cooking grease deposits on AC coils and filters, reducing efficiency and creating a fire hazard if buildup is severe. Choose a unit with an easy-access, washable pre-filter that catches grease particles before they reach the evaporator coil. Clean it monthly in a cooking-heavy kitchen.
Range Hood as First Line of Defense
Your AC is not a substitute for a proper range hood. An exhaust hood rated at ≥ 1 CFM per 100 BTU/h of total burner output captures cooking heat at the source before it enters the room — reducing the AC's required BTU/h by 30–50% during active cooking.
Pro Tip
Run your range hood for at least 15 minutes after you finish cooking. The thermal mass of pots, pans, and oven walls continues releasing heat and moisture for 10–20 minutes post-cooking. Leaving the hood running exhausts this residual load before it enters the kitchen air, reducing the total latent and sensible load your AC must handle — and preventing the stuffy, humid kitchen that lingers an hour after dinner.
Common Mistake
Never Rely Solely on AC to Remove Cooking Heat
An air conditioner recirculates indoor air; it does not remove combustion byproducts, grease particles, or excess moisture from cooking at the source. Running a gas stove in a kitchen with no range hood while depending entirely on AC to manage the heat results in a room that is simultaneously cool and clammy, with elevated CO₂ and cooking odors. Worse, grease-laden air cycling through your AC unit coats the evaporator coil, reducing efficiency by 10–20% per season without professional cleaning. Range hood + properly sized AC is the correct two-system approach.
Expert Advice
“Kitchen cooling is dominated by cooking appliances, not room size. A gas range at full output generates 40,000+ BTU/h of combustion heat — far more than any window AC can remove. Effective kitchen cooling is a two-part strategy: a range hood that exhausts cooking heat before it loads the space, plus an AC sized for the residual sensible and latent load.”
Industry Terminology
Terms You Should Know
- Combustion heat
- Thermal energy released when gas burns; a residential gas range at full output produces ~40,000 BTU/h.
- Latent heat load
- Moisture added to indoor air from steam, boiling, and dishwashing; requires a low-SHR unit to remove effectively.
- Range hood CFM
- Cubic feet per minute of air the hood exhausts; should be ≥ 1 CFM per 100 BTU/h of total burner output.
- Negative pressure
- Condition created when a range hood exhausts more air than is supplied, drawing warm outdoor air through envelope gaps.
- Sensible Heat Ratio (SHR)
- For kitchens, choose units with SHR below 0.80 to handle the significant moisture load from cooking.
- Depressurization
- Building pressure drop caused by range hood exhaust, reducing hood effectiveness and increasing infiltration load on the AC.
- Evaporator coil grease fouling
- Airborne cooking grease coating the AC coil, reducing heat transfer efficiency by 10–20% and creating a fire hazard.
Quick Reference
BTU Chart by Room Size
| Room Size | BTU Required | Tonnage |
|---|---|---|
| 100 – 150 sq ft | 5,000 BTU | 0.4 ton |
| 150 – 250 sq ft | 6,000 BTU | 0.5 ton |
| 250 – 400 sq ftBest Seller | 8,000 BTU | 0.7 ton |
| 400 – 550 sq ft | 10,000 BTU | 0.8 ton |
| 550 – 700 sq ftMost Popular | 12,000 BTU | 1.0 ton |
| 700 – 1,000 sq ft | 14,000 BTU | 1.2 ton |
| 1,000 – 1,400 sq ft | 18,000 BTU | 1.5 ton |
| 1,400 – 2,000 sq ft | 24,000 BTU | 2.0 ton |
| 2,000 – 2,500 sq ft | 30,000 BTU | 2.5 ton |
Based on ASHRAE Standard 183 guidelines. Assumes 8 ft ceilings, average insulation, and moderate sun exposure. Add 10% for kitchens; subtract 10% for heavily shaded rooms.
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