How long does a central AC install take?

Straight replacements: usually one day. Full systems with air handler work: 2–3 days.

Should I get a heat pump instead of an AC?

If you're replacing the outdoor unit anyway, a heat pump often costs only modestly more, heats your home at high efficiency, and unlocks rebates a cooling-only AC doesn't get. We'll quote both.Free central air estimate — 603-475-9027.

Do heat pumps work in New Hampshire winters?

Yes. Modern cold-climate heat pumps — like the Mitsubishi Hyper-Heat systems we install — deliver full heating capacity at 5°F and keep working below -13°F. They're now the primary heat source in thousands of NH homes. For homes with an existing furnace or boiler, we often set up a dual-fuel arrangement where the heat pump handles most of the season and the backup covers the coldest snaps.

What rebates are available for heat pumps in NH in 2026?

NHSaves currently offers $250 per ton for qualifying cold-climate heat pumps replacing oil, gas, or propane heat, and up to $1,250 per ton when replacing electric resistance heat (that tier requires utility pre-approval before installation). Systems must use newer refrigerants (R-32 or R-454B) to qualify, and the federal 25C tax credit ended December 31, 2025. We handle rebate paperwork with your quote.

Heat pump vs. furnace — which is right for my home?

If you heat with electric baseboard, oil, or propane, a cold-climate heat pump usually cuts your heating costs substantially and adds air conditioning in the same unit. If you have cheap natural gas, a high-efficiency furnace may still win on pure operating cost, and a dual-fuel setup often makes the most sense. We'll run the numbers for your actual home rather than giving a one-size answer.

What size heat pump do I need?

Sizing depends on square footage, insulation, air sealing, window quality, and layout — not just square feet. As a very rough NH guide, most homes need 25–35 BTU per square foot, but an oversized unit short-cycles and an undersized one runs constantly. We do a room-by-room load assessment on every quote so the system is sized right the first time.

How long does a mini split installation take?

Most single-zone installations are done in one day. Multi-zone systems typically take 2–3 days depending on the number of indoor heads and electrical work needed. You'll have heating/cooling in the finished zones the same day they're installed.

How often should my HVAC system be serviced?

Once a year for most systems — ideally spring for AC/heat pumps and fall for heating equipment. Regular maintenance (clean coils, correct refrigerant charge, fresh filters) keeps efficiency up, prevents mid-season breakdowns, and protects your manufacturer warranty, which often requires documented annual service.

Why is my AC running but not cooling?

The most common causes are a clogged air filter, a refrigerant leak, a frozen evaporator coil, or a failing capacitor on the outdoor unit. Check the filter first. If airflow is fine and it's still blowing warm, shut the system off to prevent compressor damage and call us at 603-475-9027 — running it in that state makes repairs more expensive.

What areas do you serve?

We're based in Kingston, NH and serve all of New Hampshire, southern Maine, Vermont, and Massachusetts. Most of our work is in Southern NH — Kingston, Exeter, Epping, Derry, Londonderry, Salem, and surrounding towns.

Exterior of a multi-story house with light green siding.

Central Air Conditioning Systems

Frequently asked questions

If your home already has ductwork, central air is the cleanest way to cool the whole house from one system — and replacing a 15-year-old unit can cut cooling bills by a third. TJM Climate Control installs and replaces central AC and ducted heat pump systems across Southern New Hampshire.

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Installation & replacement

We replace aging condensers and air handlers, install complete new systems, and — where it makes sense — recommend a ducted heat pump instead of a cooling-only AC, so the same equipment heats in winter and qualifies for NHSaves rebates. Every install starts with a load calculation; an oversized AC cools fast but leaves the house clammy because it never runs long enough to dehumidify.

What it costs

A central AC replacement (condenser + coil) typically runs [Input-range]. Full system installs with air handler run [input-range]. Exact quotes are free and itemized.

Refrigerant note for 2026

New systems now use R-32 or R-454B refrigerants. If your current system uses R-410A, repairs will get more expensive as that refrigerant is phased down — a factor worth weighing in any repair-vs-replace decision.

Central Air Conditioning Systems

Frequently asked questions

How long does a central AC install take?

Should I get a heat pump instead of an AC?

Installation & replacement

What it costs

Refrigerant note for 2026

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