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Answer a few questions about your room and we'll size it, estimate the running cost, and match you to the best-value units — no fluff, no sponsored rankings.

49
units compared
50
states covered
100%
independent
BTU Calculator

Size your AC in 60 seconds

320 ft²20 × 16 ft room
You need about
8,0009,000 BTU
⚡ HVAC Pulse
EPA Revised Refrigerant Rule Draws Praise , Criticism , and Lawsuits achrnews.com In HelloNation , HVAC Expert John Huether Breaks Down HVAC System Size for Homes in Rochester , NY prnewswire.com China Haier steps up manufacturing air conditioners to meet Europe rising demand en.people.cn New £227 a year heat pump update for united kingdom homes somersetlive.co.uk New Octopus Energy £227 a year heat pump update for customers chroniclelive.co.uk Public Universities and Facilities Harness $23M for Geothermal , Heat Pump , and Energy Efficiency renewableenergymagazine.com Scientists directly connected the solar panels , battery , and heat pump of a 208 - square - meter home and discovered that the usual path of the electricity was causing a daily waste of energy ecoticias.com Ducted or Ductless : Improve Home Comfort with an All - Climate Heat Pump nny360.com Buildings Have Changed . Has Commercial HVAC Kept Up ? achrnews.com Your House Is Draining Your Wallet : Shocking Home HVAC Performance Numbers forbes.com Hotter Summers and Rising Energy Costs : How Next - Generation Inverter Heat Pumps Can Provide Comfort and Savings dailyadvance.com Hudson Technologies Q2 Earnings Call Highlights Markets Daily What temperature should I set my thermostat in summer during heat wave The News Journal The GBA Conversation: The Building Scientist’s Home—a Conversation with Allison Bailes Green Building Advisor Intelligent Occupancy Sensor Market in Germany: Trends, Forecast and Competitive Analysis to 2031 Pr Sync Intelligent Occupancy Sensor Market in Japan: Trends, Forecast and Competitive Analysis to 2031 Pr Sync EPA Revised Refrigerant Rule Draws Praise , Criticism , and Lawsuits achrnews.com In HelloNation , HVAC Expert John Huether Breaks Down HVAC System Size for Homes in Rochester , NY prnewswire.com China Haier steps up manufacturing air conditioners to meet Europe rising demand en.people.cn New £227 a year heat pump update for united kingdom homes somersetlive.co.uk New Octopus Energy £227 a year heat pump update for customers chroniclelive.co.uk Public Universities and Facilities Harness $23M for Geothermal , Heat Pump , and Energy Efficiency renewableenergymagazine.com Scientists directly connected the solar panels , battery , and heat pump of a 208 - square - meter home and discovered that the usual path of the electricity was causing a daily waste of energy ecoticias.com Ducted or Ductless : Improve Home Comfort with an All - Climate Heat Pump nny360.com Buildings Have Changed . Has Commercial HVAC Kept Up ? achrnews.com Your House Is Draining Your Wallet : Shocking Home HVAC Performance Numbers forbes.com Hotter Summers and Rising Energy Costs : How Next - Generation Inverter Heat Pumps Can Provide Comfort and Savings dailyadvance.com Hudson Technologies Q2 Earnings Call Highlights Markets Daily What temperature should I set my thermostat in summer during heat wave The News Journal The GBA Conversation: The Building Scientist’s Home—a Conversation with Allison Bailes Green Building Advisor Intelligent Occupancy Sensor Market in Germany: Trends, Forecast and Competitive Analysis to 2031 Pr Sync Intelligent Occupancy Sensor Market in Japan: Trends, Forecast and Competitive Analysis to 2031 Pr Sync
33→16BTU per ft² — small rooms need double the cooling density of big ones
40%of window ACs people buy are the wrong size for the room
$300+typical yearly saving from a right-sized, efficient unit
60 secaverage time to a recommendation with our calculator
Editor-tracked

Popular units right now

Spec-matched value picks across window, portable and mini-split — chosen on the data, not paid placement.

See full comparison
mrcoolac
Best efficiency
Mini-splitENERGY STAR

MRCOOL DIY 4th Gen 12K

4.6(1,510)
Cooling
12,000 BTU
Covers
500 ft²
Efficiency
22 SEER2
Noise
32 dB
$1099 est.
typical retail price

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For installs & repairs

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4.8★+
avg. Google rating of listed pros
~50 yrs
avg. time in business
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FAQ

Common questions

Is CoolVerdict free to use?

Yes — the BTU calculator, comparison tools, buying guides, and HVAC-contractor directory are all free, with no sign-up required.

Is CoolVerdict independent?

Yes. Recommendations are based on specs and data, not paid placement — there are no sponsored rankings, and any future affiliate links will be clearly labeled and will not influence rankings.

Where does CoolVerdict’s data come from?

Product specs come from manufacturer documentation and independent testing, shown with each unit’s true efficiency metric (CEER, EER, SEER, or SEER2). Contractor listings are compiled from public information. See How we rate.

How accurate are the running-cost estimates?

They are estimates based on each unit’s efficiency, typical usage of about 8 hours a day, and average residential electricity rates — your actual cost varies with your utility rate and habits. The calculator personalizes it to your room and state.