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Find the right BTU capacity and tonnage for your home. Answer 6 questions and get an instant recommendation — no email required.
Not sure? Check your IECC climate zone.
Conditioned area only (200-10,000 sq ft)
Heating Capacity
66,500
BTU/hr
System Size
6
Tons
Estimated Cost
$13K–$25K
Installed
Ducted Central Heat Pump
A ducted central heat pump system is recommended for your home. This uses your existing ductwork (or new ducts) for whole-home comfort.
This calculator provides a simplified estimate based on general building science principles. A proper Manual J load calculation by a licensed HVAC contractor accounts for orientation, air infiltration, duct losses, and local design temperatures. Always get a professional assessment before purchasing.
The single biggest mistake homeowners make when buying a heat pump is getting the wrong size. Unlike furnaces, where "bigger is better" was the old rule of thumb, heat pumps perform best when precisely matched to your home's heating and cooling load.
Manual J is the industry-standard method (published by ACCA — Air Conditioning Contractors of America) for calculating the exact heating and cooling load of a building. Our calculator above uses a simplified version of these principles. A full Manual J performed by your HVAC contractor includes:
Uses your ZIP code's 99% winter and 1% summer design temperatures from ASHRAE data.
Wall construction, roof type, foundation (slab, crawlspace, basement), and air sealing.
Measures how much outside air leaks in through gaps, cracks, and penetrations.
Accounts for energy lost through ductwork in unconditioned spaces like attics.
Actual insulation levels in walls (R-13 to R-21), attic (R-38 to R-60), and floors.
Heat from occupants, appliances, lighting, and electronics reduces heating load.
Our calculator vs. Manual J: This calculator gives you a reliable ballpark estimate to understand your needs before talking to contractors. A full Manual J typically costs $150-$400 and should be performed before any installation. Any reputable HVAC contractor will perform one as part of their quote process.
Your heat pump size determines the capacity, but the system type determines how that capacity is delivered throughout your home. Here is when each type makes sense:
Best for single rooms, additions, garages, or small apartments. One outdoor unit connects to one wall-mounted indoor head. Installation takes 1 day with minimal disruption — only a 3-inch hole through the wall.
Typical cost: $4,000 - $6,500 installed
Ideal for homes without ductwork, or for zoned comfort in 2-4 rooms. One outdoor unit connects to multiple indoor heads, each with independent temperature control. Popular in older New England homes and ranch-style houses.
Typical cost: $10,000 - $18,000 installed (2-4 zones)
Best for larger homes with existing ductwork in good condition. Replaces your furnace and AC with a single system. Works like traditional central air — supply and return vents in each room. In cold climates, consider a hybrid (dual-fuel) setup with a gas furnace backup below 0°F.
Typical cost: $13,000 - $25,000 installed (including any duct modifications)
A 2,000 sq ft home in a cold climate (Zone 5) typically needs a 3-3.5 ton (36,000-42,000 BTU) heat pump. In warmer climates (Zone 2-3), 2-2.5 tons may suffice. Insulation quality, window type, and ceiling height also affect the calculation significantly.
An oversized heat pump short-cycles — it turns on and off frequently instead of running steady. This causes uneven temperatures, higher humidity indoors, increased wear on the compressor, and higher energy bills. Proper sizing is more efficient than oversizing.
An undersized heat pump runs constantly without reaching your desired temperature on the coldest or hottest days. This drives up electricity bills and may require backup electric resistance heat, which is 2-3x more expensive to operate.
Manual J is the ACCA-standard method for calculating residential heating and cooling loads. It accounts for climate, building orientation, wall construction, window area and type, insulation, air infiltration, duct losses, and internal heat gains. A proper Manual J should be performed by your HVAC contractor before installation.
Ductless mini-splits are ideal for homes without existing ductwork, room additions, or zoned comfort. Ducted systems work best for whole-home heating/cooling in homes with existing ducts in good condition. Multi-zone ductless systems can replace ducted systems for 2-4 room homes.
It depends on your climate zone. In hot-humid areas (FL, TX coast), plan for 18-22 BTU per sq ft. In mixed climates (NJ, DC), plan for 28 BTU/sq ft. In cold climates (MA, CT, NH), plan for 35 BTU/sq ft. Very cold climates (ME, VT) may need 40-45 BTU/sq ft.
Get state-specific pricing, utility rebates, and installer recommendations:
Get a free quote from vetted, licensed HVAC contractors in your area. We will match you with installers who perform Manual J calculations and right-size every system.
Get a Free Heat Pump Quote