Is a mini split worth it in New Jersey?
Short answer: Yes, for most New Jersey homes. Newark logs about 1,007 cooling hours and 2,340 heating hours a year (ENERGY STAR), so it works as the heater first and the air conditioner in summer. Every MRCOOL DIY series keeps heating below New Jersey’s coldest night of the last ten winters, −3°F in Atlantic City. Power costs 24.6¢ per kWh, above the US average of 18.2¢, so the efficiency of DIY 5th Gen saves more here. Size each room with the standard chart and go one size up for west-facing or top-floor rooms.
New Jersey by region
New Jersey 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 |
|---|---|---|---|---|
| Newark (4A) | 91.1°F | 12.1°F | 2°F | Heating first |
| Trenton (4A) | 89.8°F | 11.6°F | −2°F | Heating and cooling |
| Atlantic City (4A) | 89.5°F | 11.6°F | −3°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 New Jersey winters
Newark logs 2,340 full-load heating hours a year against 1,007 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 New Jersey winter?
Yes. New Jersey’s coldest night at these stations in the last ten winters was −3°F in Atlantic City, and the MRCOOL DIY series heat down to −12°F and −13°F.
What size for a New Jersey 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 New Jersey
Yearly cost to heat and cool one room with Newark weather, at the New Jersey average power price.
| Size | DIY Select | DIY EasyPro | DIY 5th Gen |
|---|---|---|---|
| 9K | $890 | $922 | $764 |
| 12K | $1,186 | $1,140 | $1,036 |
| 18K | $1,838 | $1,781 | $1,418 |
| 24K | $2,448 | $2,401 | $2,209 |
| 36K | – | – | $3,685 |
Estimate, not a quote: (cooling BTU × 1,007 cooling hours ÷ SEER2 + heating BTU × 2,340 heating hours ÷ HSPF2) ÷ 1,000 × 24.61¢. Hours: ENERGY STAR heat pump savings calculator (Newark). Uses MRCOOL’s cold-climate rating (HSPF2 Region V). Product pages show the standard rating (Region IV), which is higher. Other cities: Atlantic City 832 cooling and 2,198 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 New Jersey.
| 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 New Jersey
MRCOOL’s rebate data lists 3 utilities in New Jersey with rebates on our DIY models, and all of them need a participating contractor, so a DIY install usually doesn’t qualify. The federal 25C tax credit ended for systems installed after December 31, 2025.
| Utility | Up to | Who installs | Series |
|---|---|---|---|
| Public Service Electric & Gas - PSE&G (income-qualified) | $12,000 | Needs a participating contractor | DIY 5th Gen, DIY EasyPro, DIY Select |
| Atlantic City Electric (income-qualified) | $2,000 | Needs a participating contractor | DIY 5th Gen, DIY EasyPro |
| Jersey Central Power & Light (First Energy) | $1,000 | Needs a participating contractor | 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 New Jersey
Mini split questions for New Jersey
Is a mini split worth it in New Jersey?
For most homes, yes. It cools through New Jersey summers and heats through the winter, so one system covers the whole year.
Will it keep up in a New Jersey summer?
DIY EasyPro and DIY 5th Gen are rated by MRCOOL to cool with outdoor temperatures up to 122°F. Newark designs for 91.1°F.
Does it heat in a New Jersey winter?
Yes. DIY Select heats down to −12°F outside and DIY EasyPro and DIY 5th Gen down to −13°F. New Jersey’s coldest night in the last ten winters was −3°F in Atlantic City.
How much does it cost to run in New Jersey?
For a 12K room with Newark weather at 24.61¢ per kWh, about $1,186 a year with DIY Select, $1,140 with DIY EasyPro and $1,036 with DIY 5th Gen, heating and cooling together. Estimates, not quotes.
What size do I need for a New Jersey garage?
Use the same chart: measure length × width. A garage that isn’t insulated goes one size up.
Are there mini split rebates in New Jersey?
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 New Jersey take?
Verified orders ship from Kentucky in 2 to 4 business days, then 3 to 7 by freight. Shipping is free to New Jersey.