Kitchen Details
Recommended Size
A kitchen is the most heat-intensive room in most homes. Beyond the usual heat from walls, windows and people, it contains a cooktop, an oven, a refrigerator running around the clock, and often a dishwasher, all releasing heat directly into the space. Cooking also produces steam, adding a humidity load the air conditioner must remove on top of the temperature load. A floor-area calculator built for bedrooms will undersize a kitchen, leaving it hot and stuffy exactly when meals are being prepared.
| Source | Heat added to room | Notes |
|---|---|---|
| Gas cooktop in use | 3,000 to 6,000 BTU/hr | Also adds combustion moisture |
| Electric / ceramic cooktop | 2,000 to 4,000 BTU/hr | Less radiant loss than gas |
| Induction cooktop | 1,000 to 2,000 BTU/hr | Most heat goes into the pan |
| Oven in use | 1,500 to 2,500 BTU/hr | Radiates from the door and vents |
| Refrigerator (each) | 400 to 800 BTU/hr | Continuous, day and night |
| Active cook (each) | ~700 BTU/hr | Higher than a seated person |
A 12 by 10 ft kitchen (120 sq ft) in a hot climate, gas cooktop, oven in use, one refrigerator, an externally vented hood, two people cooking.
If the hood were recirculating rather than vented, the cooking heat would not be removed and the total would rise above 16,000 BTU, pushing firmly into 1.5 ton territory with little margin.
Why does a kitchen need a bigger AC than a bedroom of the same size?
A kitchen has a cooktop, oven, refrigerator and often a dishwasher all releasing heat, plus cooking steam adding humidity load. A kitchen can have 30 to 70% more cooling load than a bedroom of the same area.
How much heat does cooking add?
A gas cooktop adds 3,000 to 6,000 BTU/hr, an oven 1,500 to 2,500, and a refrigerator 400 to 800 continuously. Together they can double the base requirement during cooking.
Does a range hood reduce the AC size needed?
Yes, substantially, if it vents outside. An externally vented hood removes half or more of the cooking heat at the source. A recirculating hood removes no heat and gives little cooling benefit.
What size AC do I need for a kitchen?
Start from the normal room requirement, then add appliance loads. A 120 sq ft kitchen in a hot climate that would be 1 ton as a bedroom may need 1.5 ton with a gas cooktop, oven and refrigerator in use.
Is gas or induction better for keeping a kitchen cool?
Induction, by far. It transfers heat into the pan with little waste into the room, while gas heats the pan, the air and the room and adds combustion moisture. Switching to induction noticeably lowers the cooling load.
Appliance heat figures are typical values. Actual kitchen loads vary with appliance models, cooking intensity, and range hood effectiveness.