05 / Cooling basics7 min
How much does an air conditioner cost to run?
Estimate AC electricity cost from watts, operating time, duty cycle, and your actual utility rate without confusing capacity with power.
Read guideCategory 05
Cooling basics
Understand BTUs, electricity costs, humidity, airflow, and the labels used to sell cooling equipment.
05 / Cooling basics7 min
Will an evaporative cooler work in your climate?
Use wet-bulb depression, ventilation needs, and water maintenance—not a humidity slogan—to judge evaporative cooling.
Read guide05 / Cooling basics8 min
Portable AC vs. window AC: which compromise fits your room?
Compare net cooling, window requirements, floor space, noise, drainage, and rental constraints before choosing a room air conditioner.
Read guide05 / Cooling basics7 min
How to size a room air conditioner without guessing
Use the ENERGY STAR room-size table, then adjust for sun, people, kitchens, and the limits of square-foot estimates.
Read guide