NEEP ccASHP Specification v3.1 / ACCA Manual S Sizing Model

Cold-Climate Heat Pump Low-Ambient Derate & COP Sizer

Model heating capacity loss and Coefficient of Performance (COP) at extreme sub-zero temperatures (5°F, -4°F, and -15°F). Determine your home's thermal balance point, size backup electric heat strips (kW), and calculate fuel-switching savings against heating oil or propane.

Heating Load & Equipment Specs Manual J Design

48,000 BTU/hr (4.0 Tons)
1.5 Tons 4.0 Tons 8.0 Tons
5°F (ASHRAE 99%)
-25°F (Minnesota) 5°F (Midwest/NE) 25°F (South)
$

Electric Utility Rate

$
Capacity @ 5°F
48,000 BTU
100% Retention
Thermal Balance Point
-2°F
Zero Backup Needed > -2°F
Backup Heat Strip
5.0 kW
Auxiliary Resistance
Annual Fuel Savings
$1,845 / yr
vs Oil @ $4.15/gal

📉 Sub-Zero Capacity & COP Performance Curve NEEP ccASHP Data

Outdoor Temp Heating Output Capacity Retention COP Efficiency Heat Deficit (kW)
IRA Clean Energy Grant Stacking: Installing a NEEP-certified cold-climate heat pump qualifies for the $2,000 Federal IRA Section 25C tax credit plus up to $8,000 in state HEEHRA point-of-sale grants for low-to-moderate income households.

Need a Certified Cold-Climate Heat Pump Contractor?

Connect with pre-screened HVAC contractors certified in inverter variable-speed cold climate installations (Mitsubishi Diamond, Daikin Elite, Fujitsu Halcyon) in your metro.

⚡ Match Cold-Climate HVAC Pro