Is a mini split worth it in Colorado?
Short answer: Yes, for most Colorado homes. Denver logs about 628 cooling hours and 2,255 heating hours a year (ENERGY STAR), so it works as the heater first and the air conditioner in summer. The last ten winters went below −13°F in Denver, Colorado Springs, Pueblo and Alamosa, down to −36°F in Alamosa, colder than the DIY series heat at, so keep a backup heat source for the coldest nights there. Power costs 17.2¢ per kWh; for the lowest bill, pick DIY 5th Gen. Size each room with the standard chart and go one size up for west-facing or top-floor rooms.
Colorado by region
Colorado has two kinds of weather for a mini split. The table shows the numbers HVAC sizing uses for each region.
| Region (climate zone) | Summer high | Winter low | Coldest, last 10 winters | Main job |
|---|---|---|---|---|
| Denver (5B) | 92.3°F | −0.2°F | −24°F | Heating first, backup for cold snaps |
| Colorado Springs (5B) | 88.7°F | 2.3°F | −16°F | Heating first, backup for cold snaps |
| Pueblo (5B) | 96.2°F | 1°F | −20°F | Heating first, backup for cold snaps |
| Grand Junction (5B) | 95.5°F | 4.9°F | −4°F | Heating first |
| Alamosa (6B) | 83.7°F | −13.6°F | −36°F | Heating first, backup for cold snaps |
Design temperatures: ASHRAE 2021 climatic design conditions (1% cooling, 99.6% heating dry bulb) for each airport station. Climate zones: 2021 IECC by county (PNNL guide). Coldest: NOAA station records, December 2016 to February 2026.
Heating through Colorado winters
Denver logs 2,255 full-load heating hours a year against 628 cooling hours (ENERGY STAR). A mini split moves heat in from the outside air instead of burning fuel, and the inverter runs at partial speed for most of the winter.
Will it heat in a Colorado cold snap?
Down to −13°F, yes. In the last ten winters these stations went colder: Alamosa −36°F, Denver −24°F, Pueblo −20°F and Colorado Springs −16°F. Keep a backup heat source for the coldest nights there.
What size for a Colorado room
Measure each room (length × width) and match it to an indoor unit.
| Room size | Indoor unit | Single zone voltage |
|---|---|---|
| Up to 250 sq ft | 6K BTU (multi-zone only) | – |
| 251–400 sq ft | 9K BTU | 115V |
| 401–550 sq ft | 12K BTU | 115V |
| 551–800 sq ft | 18K BTU | 230V |
| 801–1,050 sq ft | 24K BTU | 230V |
| 1,051–1,550 sq ft | 36K BTU | 230V |
Go one size up for rooms with west or south windows, a top floor under the roof, high ceilings, poor insulation, or a kitchen. A garage that isn’t insulated also goes one size up. Full sizing guide
Several rooms? See multi-zone systems
What it costs to run in Colorado
Yearly cost to heat and cool one room with Denver weather, at the Colorado average power price.
| Size | DIY Select | DIY EasyPro | DIY 5th Gen |
|---|---|---|---|
| 9K | $568 | $593 | $491 |
| 12K | $757 | $730 | $666 |
| 18K | $1,178 | $1,148 | $906 |
| 24K | $1,564 | $1,540 | $1,423 |
| 36K | – | – | $2,360 |
Estimate, not a quote: (cooling BTU × 628 cooling hours ÷ SEER2 + heating BTU × 2,255 heating hours ÷ HSPF2) ÷ 1,000 × 17.17¢. Hours: ENERGY STAR heat pump savings calculator (Denver). Uses MRCOOL’s cold-climate rating (HSPF2 Region V). Product pages show the standard rating (Region IV), which is higher. Other cities: Colorado Springs 523 cooling and 2,418 heating hours, Pueblo 834 cooling and 2,018 heating hours, Grand Junction 997 cooling and 2,352 heating hours, Alamosa 97 cooling and 2,947 heating hours. Power price: EIA, August 2026.
What the equipment costs
Prices for complete single zone systems: outdoor unit, indoor unit, pre-charged line set and remote. Shipping is free to Colorado.
| Size | DIY Select | DIY EasyPro | DIY 5th Gen |
|---|---|---|---|
| 9K | $1,249 | $1,487 | $2,329 |
| 12K | $1,399 | $1,599 | $2,359 |
| 18K | $1,690 | $1,806 | $2,909 |
| 24K | $1,899 | $2,109 | $3,329 |
| 36K | – | – | $3,769 |
Rebates in Colorado
MRCOOL’s rebate data lists 8 utilities in Colorado with rebates on our DIY models. 3 of them need a participating contractor, so a DIY install usually doesn’t qualify there; for the others, confirm with your utility. The federal 25C tax credit ended for systems installed after December 31, 2025.
| Utility | Up to | Who installs | Series |
|---|---|---|---|
| Xcel Energy | $5,750 | No contractor rule listed, confirm with your utility | DIY 5th Gen |
| Fort Collins Utilities / Efficiency Works | $3,916 | Needs a participating contractor | DIY 5th Gen |
| Black Hills Energy | $3,280 | No contractor rule listed, confirm with your utility | DIY 5th Gen, DIY EasyPro, DIY Select |
| Colorado Springs Utilities | $3,000 | No contractor rule listed, confirm with your utility | DIY 5th Gen |
| Boulder County, CO (income-qualified) | $2,000 | No contractor rule listed, confirm with your utility | DIY 5th Gen, DIY EasyPro, DIY Select |
| Poudre Valley REA | $1,500 | Needs a participating contractor | DIY 5th Gen |
| United Power | $500 | No contractor rule listed, confirm with your utility | DIY 5th Gen |
| Colorado - Tax Credit - Air Source Heat pump - Ductless | $333 | Needs a participating contractor | DIY 5th Gen, DIY EasyPro |
Rebates checked November 2026. Amounts change; confirm with your utility.
DIY or a pro
MRCOOL DIY systems are built for a homeowner install: the line set comes pre-charged and connects by hand, so there’s no vacuum pump or refrigerant work. Most people hire an electrician for the new circuit, and permit rules depend on your city. Can you install a mini split yourself?
Which MRCOOL system for Colorado
Mini split questions for Colorado
Is a mini split worth it in Colorado?
For most homes, yes. It cools through Colorado summers and heats through the winter, so one system covers the whole year; keep a backup heat source for the coldest nights.
Will it keep up in a Colorado summer?
DIY EasyPro and DIY 5th Gen are rated by MRCOOL to cool with outdoor temperatures up to 122°F. Pueblo designs for 96.2°F.
Does it heat in a Colorado winter?
Yes. DIY Select heats down to −12°F outside and DIY EasyPro and DIY 5th Gen down to −13°F. The last ten winters went colder than that: Alamosa −36°F, Denver −24°F, Pueblo −20°F and Colorado Springs −16°F. Keep a backup heat source for those nights.
How much does it cost to run in Colorado?
For a 12K room with Denver weather at 17.17¢ per kWh, about $757 a year with DIY Select, $730 with DIY EasyPro and $666 with DIY 5th Gen, heating and cooling together. Estimates, not quotes.
What size do I need for a Colorado garage?
Use the same chart: measure length × width. A garage that isn’t insulated goes one size up.
Are there mini split rebates in Colorado?
Some utilities list rebates for MRCOOL DIY models; see the table above. Check each program’s rules: many need a participating contractor. The federal 25C tax credit ended for systems installed after December 31, 2025.
Can I install it myself?
Yes. The pre-charged line set connects by hand, with no vacuum pump. Most people hire an electrician for the circuit, and permit rules depend on your city.
How long does shipping to Colorado take?
Verified orders ship from Kentucky in 2 to 4 business days, then 3 to 7 by freight. Shipping is free to Colorado.