Pillar guide
How to Buy a Cold-Climate Heat Pump That Actually Heats at 5°F
A source-cited guide to 5°F capacity, sizing, altitude, backup heat, Colorado rebates, and how to check a heat pump quote before you sign.
Heat pumps that actually heat when it's 5°F outside
Plain-English, source-cited guides to cold-climate heat pumps and mini-splits for Colorado homeowners. Learn the numbers that matter, how sizing should work, and how to check a quote before you sign.
Start with the buying guide →Start here
Cold-climate selection & sizing
"Rated to -22°F" Doesn't Mean What You Think: Heat Pump Capacity vs. Operating Range
A low-temperature rating says how cold a heat pump keeps running, not how much heat it makes. Here is how to find the capacity number that matters.
Cold-climate selection & sizing
Heat Pump Sizing for Cold Climates: Why Square-Foot Rules of Thumb Get Homes Wrong
How cold-climate heat pumps should be sized: load calcs, the four sizing approaches, balance points, oversizing limits, altitude, and ductwork.
Why trust this site?
- How guides are made. Drafted with AI assistance, fact-checked against cited sources, and informed by field installation experience. No made-up stories. The site is owned by Cale Reeves, a lead heat pump & mini-split installer in Colorado. About the site.
- Numbers come with sources. Capacity, rebate, and spec claims link to ENERGY STAR, NEEP, DOE, utilities, and state agencies, and each guide shows a "facts verified" date.
- Honest about money. Retailer links may earn the site a commission. That never decides what we recommend. Read the disclosure.
Quick answers
Do heat pumps work in cold climates?
Cold-climate models are built for it. What matters is whether the specific system makes enough heat at your coldest temperatures (check heating capacity at 5°F), and what your backup plan is. What "rated to -22°F" really means.
How do I know what size heat pump I need?
From a Manual J load calculation, not square footage. Then the equipment gets selected from real performance data. Cold-climate sizing, step by step.
Is there still a federal heat pump tax credit?
No. The federal 25C credit ended for equipment placed in service after December 31, 2025 (IRS). State and utility rebates may still apply. See the Colorado rundown.