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 guideThe reference desk
Home cooling, without the hot air.
Start with your room and constraints. We will help you understand the equipment from there.
04 / Difficult spaces9 min
Best cooling options for an apartment, by constraint
Choose among window AC, portable AC, evaporative cooling, fans, and permanent systems based on the lease, window, climate, and room.
Read guide04 / Difficult spaces8 min
Cooling a garage or workshop: AC, evaporative, or airflow?
Choose a garage cooling strategy based on climate, open doors, insulation, contaminants, and how long people actually occupy the space.
Read guide04 / Difficult spaces8 min
How to cool an attic or loft bedroom
Separate roof heat gain, air leakage, equipment sizing, and installation constraints before choosing an attic cooling solution.
Read guide04 / Difficult spaces8 min
How to cool a room with a casement window
Four workable approaches for crank-out windows, including vertical window units, portable AC panels, mini-splits, and non-compressor options.
Read guide01 / Portable AC6 min
Dual-hose vs. single-hose portable AC
Understand pressure, replacement air, hose heat, and why hose count alone does not prove which portable AC is best.
Read guide05 / 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 guide03 / Mini-splits9 min
Before buying a mini-split: 12 installation questions
A consumer checklist covering load calculations, electrical work, refrigerant rules, condensate, permits, warranties, and service access.
Read guide03 / Mini-splits7 min
Mini-split sizing: why square feet are only the beginning
Learn what a residential load calculation considers and why maximum BTUs, minimum output, climate performance, and zone design all matter.
Read guide01 / Portable AC6 min
DOE SACC vs. ASHRAE BTUs: the portable AC label explained
Portable air conditioners often show two capacities. Learn why DOE SACC is lower and which number belongs in a fair comparison.
Read guide01 / Portable AC7 min
Portable AC venting options for renters
Plan a removable, sealed exhaust path without damaging the building or defeating the air conditioner's cooling.
Read guide01 / Portable AC5 min
Can you use a portable AC without a window?
A portable air conditioner needs an approved route for condenser heat. A window is common, but it is not the only possible exterior opening.
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 guide02 / Window AC7 min
Window AC installation safety checklist
Check window compatibility, support, drainage, electrical instructions, egress, security, and recalls before operating a room air conditioner.
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