04 / 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 guideIndependent HVAC & cooling advice
Make your home work with the heat.
Understand the equipment, labels, installation questions, and real operating costs before you buy.
Comfort index72°F
Research first. Buy once.
Start with the space
01
Portable AC
Sizing, venting, efficiency, and realistic expectations for portable air conditioners.
→02Window AC
How to choose and safely install room air conditioners for standard and unusual windows.
→03Mini-splits
Consumer guidance on ductless systems, installation questions, sizing, and ownership costs.
→04Difficult spaces
Practical cooling options for rentals, attics, garages, and rooms conventional AC cannot reach.
→05Cooling basics
Understand BTUs, electricity costs, humidity, airflow, and the labels used to sell cooling equipment.
→Read before you shop
The details the product box leaves out.
01 / 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 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 guide08k
Free calculators
Turn the label into numbers that mean something at home.
Our standard
Useful beats loud.
We start with primary documentation from ENERGY STAR, the Department of Energy, EPA, CPSC, and equipment manufacturers. We separate standardized ratings from promises about your room.
See how we research