FIRST-TIME BUYER GUIDE 🇺🇸 US
Buying your first AC
in the U.S. — the guide
Everything that surprises first-time buyers, before you spend a dollar.
Seven things first-time buyers should check
- Your window type decides your options. Classic up-and-down (double-hung) windows fit standard window units. Sliding or crank windows usually mean a portable unit or a special mount.
- Renting? No-drill support brackets exist, and if the lease forbids window units entirely, a portable is your route.
- Check the outlet. Most units up to ~12,000 BTU run on a regular 115V household outlet. Bigger units may need a dedicated 230V circuit — an electrician job.
- Right-sized beats over-sized. An oversized AC cools fast but shuts off before drying the air — cold and clammy. Undersized runs nonstop and never keeps up. That's why sizing comes first.
- Look for the ENERGY STAR label. Higher CEER means a lower power bill. Inverter models cost more up front but run cheaper and much quieter.
- Bedroom? Check the noise rating. Anything near 50 dB or below is sleep-friendly; inverter and U-shaped designs are the quietest.
- Measure before you shop. Window units list the minimum and maximum window width they fit, right on the box — measure your opening, and snap a photo of your outlet while you're at it.