Is a mini split worth it in Texas?
Short answer: Yes, for most Texas homes. Cooling is the main job and humidity comes second. Size each room with the standard chart and go one size up for west-facing or top-floor rooms. All three MRCOOL DIY series keep heating down to −12°F or −13°F, below the coldest Texas design temperature. Near the coast, pick a unit with the Gold Fin coating (DIY EasyPro or DIY 5th Gen). For the lowest power bill over a long cooling season, pick DIY 5th Gen.
Texas by region
Texas has three 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 | Feb 2021 | Main job |
|---|---|---|---|---|
| Houston and Gulf Coast (2A) | 95.7°F | 31.4°F | 13°F | Cooling and humidity |
| Dallas-Fort Worth (2A) | 99.1°F | 23.4°F | −2°F | Cooling plus winter heat |
| Austin (2A) | 98.4°F | 26.6°F | 6°F | Cooling and humidity |
| San Antonio (2A) | 97.7°F | 30.0°F | 9°F | Cooling and humidity |
| Corpus Christi (2A) | 95.4°F | 34.6°F | 17°F | Cooling and humidity |
| Rio Grande Valley (McAllen) (1A) | 99.7°F | 38.5°F | 22°F | Mostly cooling |
| El Paso (3B) | 99.1°F | 25.7°F | 14°F | Cooling plus winter heat |
| Amarillo and Panhandle (4B) | 96.1°F | 10.8°F | −11°F | Cooling plus winter heat |
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). February 2021 lows: NOAA station records, Feb 13 to 17, 2021.
Cooling in Texas heat and humidity
In most of Texas a mini split runs for months on end. The inverter slows down instead of switching off, so it keeps pulling water out of the air while it cools.
Will it heat in a Texas freeze?
Yes. Every MRCOOL DIY series keeps heating below the coldest temperatures Texas recorded in the February 2021 storm.
What size for a Texas room
Measure each room (length × width) and match it to an indoor unit. The Texas sun doesn’t change the chart, but it does change which end of a range you land on.
| 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 Texas
Yearly cooling cost for one room running a typical Texas cooling season, at the Texas average power price.
| Size | DIY Select | DIY EasyPro | DIY 5th Gen |
|---|---|---|---|
| 9K | $181 | $157 | $134 |
| 12K | $241 | $216 | $179 |
| 18K | $345 | $299 | $281 |
| 24K | $490 | $446 | $372 |
| 36K | – | – | $703 |
Estimate, not a quote: cooling BTU × 2,209 cooling hours ÷ SEER2 ÷ 1,000 × 15.91¢. Cooling hours are the Houston zone value in the Texas Technical Reference Manual v12 (Table 30). Corpus Christi and the Rio Grande Valley run about a third more (2,958 hours), Dallas-Fort Worth 13% less (1,926), El Paso 31% less (1,524) and Amarillo about half (1,142). SEER2 per size from MRCOOL’s spec sheets.
What the equipment costs
Prices for complete single zone systems: outdoor unit, indoor unit, pre-charged line set and remote. Shipping is free to Texas.
| 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 Texas
Most Texas utility rebates need a participating contractor, so a DIY install usually doesn’t qualify. MRCOOL’s rebate data lists three Texas utilities with rebates on our DIY models, all through contractors. The federal 25C tax credit ended for systems installed after December 31, 2025, and Texas has no state rebate for these models.
| Utility | Up to | Who installs | Series |
|---|---|---|---|
| Austin Energy | $950 | Needs a participating contractor | DIY 5th Gen, DIY EasyPro |
| CPS Energy (San Antonio) | $275 per cooling ton | Needs a participating contractor | DIY 5th Gen, DIY EasyPro ($225 per ton for DIY Select) |
| CenterPoint Energy (Houston) | From $200 | Needs a participating contractor | All three |
No rebate listed for MRCOOL DIY models from Oncor (Dallas-Fort Worth), El Paso Electric, AEP Texas (Corpus Christi, Rio Grande Valley, Laredo), Xcel Energy (Amarillo), Entergy Texas or Lubbock Power & Light. 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 Texas
Mini split questions for Texas
Is a mini split worth it in Texas?
For most Texas homes, yes. A mini split cools for 1,142 to 2,958 full-load hours a year depending on the region (ENERGY STAR), it pulls moisture out while it cools, and it heats through Texas winters.
Will it keep up when it’s 105°F outside?
DIY EasyPro and DIY 5th Gen are rated by MRCOOL to cool with outdoor temperatures up to 122°F. Size each room with the chart above and go one size up for west-facing or top-floor rooms.
Does it heat during a Texas freeze?
Yes. DIY Select heats down to −12°F outside and DIY EasyPro and DIY 5th Gen down to −13°F. The coldest Texas reading in the February 2021 storm was −11°F in Amarillo.
How much does it cost to run in Texas?
For a 12K room with Houston-area cooling hours at 15.91¢ per kWh, about $241 a year with DIY Select, $216 with DIY EasyPro and $179 with DIY 5th Gen. Estimates, not quotes.
What size do I need for a Texas garage?
Use the same chart: measure length × width. A garage that isn’t insulated goes one size up.
Are there mini split rebates in Texas?
Austin Energy, CPS Energy and CenterPoint list rebates for MRCOOL DIY models, and all three 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 Texas take?
Verified orders ship from Kentucky in 2 to 4 business days, then 3 to 7 by freight. Shipping is free to Texas.