Guides
Five things worth understanding before you sign a heat pump quote. Each one is written against the EPA's certified list and the official test standards, with the sources named so you can check them yourself.
How to find and check the AHRI certificate number for your heat pump
The one number that fixes what your system is certified to do, where it lives on a quote, and how to verify it against the official directory yourself.
Why one outdoor unit has several HSPF2 ratings
The same outdoor model is certified at a different efficiency depending on the indoor coil. What causes it, how far apart the ratings get, and what that means for a quote that names only the outdoor unit.
How to work out heat pump running cost from HSPF2 and your electricity rate
The arithmetic, worked through with real numbers, plus the three places where a running-cost estimate usually goes wrong.
What to check on a heat pump quote
Outdoor unit, indoor coil, certificate, and the consumption assumptions behind any savings figure. A checklist you can work through before you sign.
The same outdoor model number under a different brand
Our own count from the certified list: how many outdoor model numbers appear under more than one brand, how to spot it on your own quotes, and what it does not tell you.
Written by Adrián Criado, who built and maintains this dataset. Not an HVAC contractor —what that does and does not qualify me to say. Sizing, installation and permitting decisions belong to a licensed contractor who has seen your home.