What is the actual difference between central AC and a heat pump?

Mechanically, very little. Both use an outdoor condenser, a refrigerant circuit, and an indoor coil to move heat out of your house in summer. A heat pump adds a reversing valve that lets it run the cycle backward in winter — pulling heat from outdoor air and delivering it inside. So a heat pump does everything a central AC does, plus heating. In cooling mode their efficiency (SEER2) and comfort are equivalent.

If I only want cooling, should I still buy a heat pump?

In Massachusetts in 2026, usually yes. A heat pump costs modestly more upfront than a cooling-only central AC, but it qualifies for up to $8,500 in Mass Save rebates and the 0% HEAT Loan — incentives a cooling-only AC does not get. The rebate often more than covers the price difference, and you gain a heating system (or an efficient supplement to your existing one) for effectively no extra net cost. Buying cooling-only leaves that money on the table.

Does central AC qualify for any Mass Save rebate?

Essentially no. Mass Save's heating-and-cooling incentives are built around electrification — the big rebates ($8,500 whole-home, $1,125/ton partial) attach to heat pumps, not to cooling-only air conditioners. A standalone central AC install earns little to nothing. This is by design and is the single biggest financial reason to choose the heat pump.

How does the R-410A phase-out affect this decision in 2026?

Both new central ACs and new heat pumps must now use low-GWP refrigerant (R-32 or R-454B); R-410A equipment came off the Mass Save Heat Pump Qualified Products List on January 1, 2026. Since you're buying new low-GWP equipment either way, there's no refrigerant reason to prefer cooling-only AC — and only the heat pump version earns the rebate.

Will a heat pump cool as well as a dedicated central AC in a MA summer?

Yes. In cooling mode a heat pump and a central AC of the same rated SEER2 are functionally identical — same dehumidification, same comfort. Massachusetts summers are well within any modern heat pump's cooling envelope. You give up nothing on cooling by choosing the heat pump.

When does cooling-only central AC actually make sense?

Narrow cases: you have a recently installed, efficient gas furnace or boiler you're firmly keeping, you only need to add cooling, and you don't want the heat pump to touch your heating at all. Even then, a heat pump run in cooling-primary mode (with the furnace as heat) captures the partial-home rebate — so pure cooling-only AC is rarely the better financial choice. See dual-fuel for that hybrid path.

Central AC vs Heat Pump for Massachusetts Homes (2026)

By MassHVAC Editorial Team Reviewed by MassHVAC Editorial Team Last updated 2026-09-19

Factor	Cooling-only central AC	Heat pump (cools + heats)
Install cost (whole-home)	$8,000–$16,000	$18,000–$28,000 (whole-home) / $8,000–$16,000 (single/multi-zone)
Mass Save rebate (2026)	Effectively none	Up to $8,500
Provides heating?	No	Yes
Summer cooling comfort	Excellent	Excellent (identical)
Refrigerant (2026)	R-32 / R-454B	R-32 / R-454B
HEAT Loan eligible?	No	Yes (0% APR up to $25K)

A heat pump is central AC that also heats

The most useful way to frame this decision: you are not choosing between two different machines, you're choosing whether the machine you're already buying can also heat. Central AC and a heat pump share the same outdoor condenser, the same refrigerant circuit, and the same indoor delivery — ducted air handler or ductless heads. The heat pump just adds a reversing valve. In summer, they cool identically. In winter, one sits idle and the other is a heating system. For form-factor questions (ducted vs ductless), see ductless heating & cooling and central AC installation.

The rebate is the whole decision

In Massachusetts, Mass Save deliberately steers incentives toward electrification. A cooling-only central AC earns almost nothing. The heat pump version of the same install earns up to $8,500, plus the 0% HEAT Loan and (for income-qualified homeowners) Enhanced caps up to $16,000. That rebate frequently covers the entire price gap between cooling-only and heat pump — so you gain a heating capability for close to zero net cost. Choosing cooling-only is choosing to forfeit that money.

Massachusetts incentives

Mass Save rebates the heat pump captures (and central AC doesn't)

See the full Mass Save rebates hub

Verified 2026-09-19

Most homes

Whole-Home Heat Pump Rebate

$2,650 /ton

Capped at $8,500 per home

The installed heat pump must be the sole source of heating and cooling for the spaces served. Equipment must be ENERGY STAR Cold Climate certified and listed on the Mass Save Heat Pump Qualified Products List (HPQPL). A Manual J load calculation is needed to qualify for the sizing bonus and is industry-standard practice on Mass Save projects.

Partial-Home / Supplemental Heat Pump Rebate

$1,125 /ton

Capped at $8,500 per home

Heat pump installed alongside an existing primary heating system. Equipment must be on the HPQPL. Lower per-ton rebate reflects supplemental rather than sole-source use.

Basic Heat Pump Rebate

$250 /ton

Capped at $2,500 per home

New for 2026. Applies to replacing an existing heat pump with a new qualified HPQPL-listed heat pump, or conditioning a previously unconditioned space.

$500 Right-Sized Equipment Bonus Partial-home

Partial-home installs only. Equipment must be sized to meet 90–120% of the total heating load at the outdoor design temperature, documented via an ACCA Manual J load calculation submitted with the rebate application.

$500 Weatherization Bonus Partial-home

Partial-home installs only. Requires a Mass Save Home Energy Assessment plus installation of the recommended weatherization (typically air sealing and insulation) within one year prior to or up to six months after the heat pump installation.

Financing

Mass Save HEAT Loan

0% APR up to $25,000

Below 135% of State Median Income: 7 years (84 months)
135%–300% of State Median Income: 5 years (60 months)
Over 300% of State Median Income: 3 years (36 months)

Subject to bank underwriting through participating Massachusetts lenders. Covers equipment + installation costs for qualifying high-efficiency upgrades (heat pumps, ductless mini-splits, insulation, water heaters, and batteries enrolled in ConnectedSolutions). A Home Energy Assessment is mandatory before financing a whole-home heat pump. Households below approximately 81% SMI typically route to Mass Save's no-cost / enhanced-rebate programs rather than the HEAT Loan.

No federal heat pump tax credit applies in 2026.

Section 25C Energy Efficient Home Improvement Credit (heat pump portion) (30% of cost up to $2,000 annually for qualifying heat pump installations (inflation reduction act expansion)) ended for property placed in service after 2025-12-31 under the One Big Beautiful Bill Act (P.L. 119-21).
Section 25D Residential Clean Energy Credit (geothermal portion) (30% of installed cost for ground-source (geothermal) heat pumps, with no dollar cap) ended for property placed in service after 2025-12-31 under the One Big Beautiful Bill Act (P.L. 119-21).

Status as of 2026-09-19: neither 25C nor 25D has been reinstated or replaced by Congress. Pending bills (e.g. H.R. 616) have not advanced. Pre-2026 §25D installs may carry forward unused credits.

Rebate amounts and eligibility verified 2026-09-19 against primary program documentation. We re-check before any publish.

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The 2026 refrigerant angle

Since January 1, 2026, new residential systems — AC or heat pump — must use low-GWP refrigerant (R-32 or R-454B); R-410A equipment was removed from the Mass Save HPQPL. Because you're buying new low-GWP equipment either way, the refrigerant transition doesn't favor cooling-only AC. If anything it reinforces the heat pump choice: you're installing new-generation equipment anyway, so you may as well install the version that heats and earns the rebate.

The narrow case for cooling-only AC

Cooling-only central AC can still be defensible if you have a recently installed, efficient furnace or boiler you're committed to keeping for years and you truly only want to add summer cooling. Even then, running a heat pump in cooling-primary mode with your existing heat as backup — a dual-fuel setup — captures the partial-home rebate while still leaning on your current heating. For the heating-side comparison against furnaces, see heat pump vs furnace; for boiler-heated homes, see heat pump vs boiler.

Central AC vs heat pump FAQ

What is the actual difference between central AC and a heat pump?: Mechanically, very little. Both use an outdoor condenser, a refrigerant circuit, and an indoor coil to move heat out of your house in summer. A heat pump adds a reversing valve that lets it run the cycle backward in winter — pulling heat from outdoor air and delivering it inside. So a heat pump does everything a central AC does, plus heating. In cooling mode their efficiency (SEER2) and comfort are equivalent.
If I only want cooling, should I still buy a heat pump?: In Massachusetts in 2026, usually yes. A heat pump costs modestly more upfront than a cooling-only central AC, but it qualifies for up to $8,500 in Mass Save rebates and the 0% HEAT Loan — incentives a cooling-only AC does not get. The rebate often more than covers the price difference, and you gain a heating system (or an efficient supplement to your existing one) for effectively no extra net cost. Buying cooling-only leaves that money on the table.
Does central AC qualify for any Mass Save rebate?: Essentially no. Mass Save's heating-and-cooling incentives are built around electrification — the big rebates ($8,500 whole-home, $1,125/ton partial) attach to heat pumps, not to cooling-only air conditioners. A standalone central AC install earns little to nothing. This is by design and is the single biggest financial reason to choose the heat pump.
How does the R-410A phase-out affect this decision in 2026?: Both new central ACs and new heat pumps must now use low-GWP refrigerant (R-32 or R-454B); R-410A equipment came off the Mass Save Heat Pump Qualified Products List on January 1, 2026. Since you're buying new low-GWP equipment either way, there's no refrigerant reason to prefer cooling-only AC — and only the heat pump version earns the rebate.
Will a heat pump cool as well as a dedicated central AC in a MA summer?: Yes. In cooling mode a heat pump and a central AC of the same rated SEER2 are functionally identical — same dehumidification, same comfort. Massachusetts summers are well within any modern heat pump's cooling envelope. You give up nothing on cooling by choosing the heat pump.
When does cooling-only central AC actually make sense?: Narrow cases: you have a recently installed, efficient gas furnace or boiler you're firmly keeping, you only need to add cooling, and you don't want the heat pump to touch your heating at all. Even then, a heat pump run in cooling-primary mode (with the furnace as heat) captures the partial-home rebate — so pure cooling-only AC is rarely the better financial choice. See dual-fuel for that hybrid path.

Related guides

Adding or replacing central AC in Massachusetts?

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