Is a mini split worth it in Pennsylvania?
Short answer: Yes. In Pennsylvania a mini split is a heater first: Pittsburgh logs 2,380 full-load heating hours a year against 737 cooling hours (ENERGY STAR). Winter design lows run from 13.8°F in Philadelphia to 4.2°F around Scranton, and the coldest reading in the last ten winters was −11°F in Pittsburgh, all above the −12°F and −13°F the MRCOOL DIY series heat down to. Power costs 21.8¢ per kWh, so the efficiency of DIY 5th Gen adds up over a long heating season.
Pennsylvania by region
Pennsylvania 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 |
|---|---|---|---|---|
| Philadelphia (4A) | 90.8°F | 13.8°F | 4°F | Heating and cooling |
| Harrisburg (4A) | 89.5°F | 10.4°F | −7°F | Heating and cooling |
| Allentown (5A) | 88.5°F | 8.1°F | −9°F | Heating first |
| Scranton / Wilkes-Barre (5A) | 86.5°F | 4.2°F | −9°F | Heating first |
| Williamsport (5A) | 87.7°F | 5.3°F | −6°F | Heating first |
| Pittsburgh (5A) | 86.4°F | 4.3°F | −11°F | Heating first |
| Erie (5A) | 84.4°F | 4.8°F | −9°F | Heating first |
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 Pennsylvania winters
Every Pennsylvania city in the table logs more than twice as many heating hours as cooling hours (ENERGY STAR).
Will it heat in a Pennsylvania cold snap?
Yes. The coldest reading at these stations in the last ten winters was −11°F in Pittsburgh, above the −12°F and −13°F the MRCOOL DIY series heat down to.
What size for a Pennsylvania 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 Pennsylvania
Yearly cost to heat and cool one room with Pittsburgh weather, at the Pennsylvania average power price.
| Size | DIY Select | DIY EasyPro | DIY 5th Gen |
|---|---|---|---|
| 9K | $768 | $801 | $664 |
| 12K | $1,024 | $987 | $900 |
| 18K | $1,592 | $1,549 | $1,226 |
| 24K | $2,115 | $2,081 | $1,921 |
| 36K | – | – | $3,191 |
Estimate, not a quote: (cooling BTU × 737 cooling hours ÷ SEER2 + heating BTU × 2,380 heating hours ÷ HSPF2) ÷ 1,000 × 21.77¢. Hours: ENERGY STAR heat pump savings calculator (Pittsburgh). Uses MRCOOL’s cold-climate rating (HSPF2 Region V). Product pages show the standard rating (Region IV), which is higher. Philadelphia: 1,032 cooling and 2,328 heating hours; Erie: 482 and 2,901. 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 Pennsylvania.
| 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 Pennsylvania
MRCOOL’s rebate data lists 5 utilities in Pennsylvania with rebates on our DIY models and no contractor rule for them. Confirm with your utility that a DIY install qualifies before you count on the rebate. The federal 25C tax credit ended for systems installed after December 31, 2025.
| Utility | Up to | Who installs | Series |
|---|---|---|---|
| Penelec (FirstEnergy) | $1,500 | No contractor rule listed, confirm with your utility | DIY 5th Gen |
| Met-Ed (FirstEnergy) | $1,500 | No contractor rule listed, confirm with your utility | DIY 5th Gen |
| West Penn Power (FirstEnergy) | $1,500 | No contractor rule listed, confirm with your utility | DIY 5th Gen |
| PECO Energy Co | $300 | No contractor rule listed, confirm with your utility | DIY 5th Gen, DIY EasyPro |
| PPL Electric Utilities (income-qualified) | $225 | No contractor rule listed, confirm with your utility | DIY 5th Gen |
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 Pennsylvania
Mini split questions for Pennsylvania
Is a mini split worth it in Pennsylvania?
Yes. It heats through Pennsylvania winters and cools through the summer, and the coldest readings of the last ten winters stayed above the heating limit of every DIY series.
Will it heat in a Pennsylvania cold snap?
DIY EasyPro and DIY 5th Gen heat down to −13°F outside and DIY Select to −12°F. The coldest reading in ten winters was −11°F in Pittsburgh.
Does it cool well in a Pennsylvania summer?
Yes. Philadelphia designs for 90.8°F, and DIY EasyPro and DIY 5th Gen are rated to cool with outdoor temperatures up to 122°F.
How much does it cost to run in Pennsylvania?
For a 12K room with Pittsburgh weather at 21.77¢ per kWh, about $1,024 a year with DIY Select, $987 with DIY EasyPro and $900 with DIY 5th Gen, heating and cooling together. Estimates, not quotes.
What size do I need for a Pennsylvania garage?
Use the same chart: measure length × width. A garage that isn’t insulated goes one size up.
Are there mini split rebates in Pennsylvania?
Several utilities list rebates for MRCOOL DIY models; see the table above and check each program’s rules. 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 Pennsylvania take?
Verified orders ship from Kentucky in 2 to 4 business days, then 3 to 7 by freight. Shipping is free to Pennsylvania.