What is Coefficient of Performance (COP) in heat pumps?

The Coefficient of Performance (COP) is the ratio of useful heat energy delivered to the electrical energy consumed. A COP of 3.0 means the heat pump moves 3 kilowatt-hours of thermal heat into your home for every 1 kilowatt-hour of electricity consumed (300% thermodynamic efficiency), because it absorbs ambient heat from outdoor air rather than burning fuel.

Is a heat pump cheaper to run than a natural gas furnace?

It depends on local utility rates. To compare, calculate the cost per Million BTU (MMBTU). A heat pump with a COP of 3.2 using $0.16/kWh electricity delivers heat at approximately $14.65 per MMBTU. A 90% efficient gas furnace paying $1.40/therm delivers heat at $15.55 per MMBTU. In areas with high gas prices or where clean solar power is available, heat pumps provide significant operating savings.

Do heat pumps work effectively in freezing winter climates?

Yes. Modern Cold-Climate Air-Source Heat Pumps (ccASHP) utilizing variable-speed inverter compressors and specialized refrigerants (like R-410A or R-32) maintain a COP between 1.8 to 2.2 even in freezing temperatures down to -15°F (-26°C) without requiring supplemental electric resistance backup heat strips.

Heat Pump COP & Heating Cost Comparison Calculator

Compare Heat Pump COP & Fuel Costs

Simulate annual heating bills, delivered BTUs per dollar, and 10-year fuel savings between air-source heat pumps, gas furnaces, and electric baseboard heating.

Clean Heating Explore certified local heat pump installer quotes, IRA heat pump rebates ($2,000 tax credit), and smart thermostats.

Utility Rates & Home Heating Load

Annual Home Heating Demand

Electricity Price ($/kWh)

Natural Gas ($/Therm)

Heat Pump Seasonal COP 3.20 COP (320% Eff)

2.0 (Freezing 0°F) 3.2 (Seasonal Avg) 4.5 (Mild 55°F)

Gas Furnace Efficiency (AFUE) 85% AFUE

80% (Standard) 90% (Condensing) 98% (High-Tier)

Heat Pump Annual $824 Per heating season

Gas Furnace Annual $853 Per heating season

Electric Resistance $2,637 Baseboard heaters

📊 Delivered Heat Cost per Million BTU (MMBTU)

True Apples-to-Apples

Heat Pump (COP 3.2):

$16.48 / MMBTU

Natural Gas Furnace (85%):

$17.06 / MMBTU

Electric Baseboard (100%):

$52.75 / MMBTU

💰 10-Year Savings vs Electric Resistance

+$18,130 Saved

Replacing resistive electric baseboards with an air-source heat pump cuts electrical consumption by over 68%, saving thousands every winter while adding summer air conditioning.

How Heat Pump Thermodynamics & COP Work

1. Moving Heat vs Creating Heat

Traditional furnaces and baseboards burn fuel or run current through high-resistance wires to create heat. The maximum possible thermodynamic efficiency is 100% (1 unit in = 1 unit out).

Heat pumps do not create heat; they use a closed refrigeration cycle to extract heat energy from ambient outdoor air and compress it into your living space, achieving 300% to 400% efficiency (COP 3.0 to 4.0).

2. The MMBTU Universal Normalizer

Utility bills quote different units (Kilowatt-hours vs Therms vs Gallons). To compare fairly, convert all energy sources into 1 Million BTU (MMBTU):

1 kWh = 3,412 BTU

1 Therm Natural Gas = 100,000 BTU

Frequently Asked Questions

What is the difference between COP, HSPF2, and SEER2? ▾

COP (Coefficient of Performance) is a dimensionless ratio of instantaneous efficiency at a specific operating temperature. HSPF2 (Heating Seasonal Performance Factor) measures seasonal heating efficiency across a full winter season in BTU/watt-hour (COP ≈ HSPF2 / 3.412). SEER2 measures cooling efficiency during summer months.

What government incentives are available for heat pumps? ▾

In the United States, the Inflation Reduction Act (IRA) Section 25C provides a 30% federal tax credit up to $2,000 for qualifying heat pump installations, along with state HOMES rebates up to $8,000 for income-eligible households. Similar decarbonization subsidies exist across the UK (Boiler Upgrade Scheme £7,500) and European Union.

Can a heat pump replace both my furnace and air conditioner? ▾

Yes. A heat pump contains a 4-way reversing valve that reverses the flow of refrigerant. In winter it pumps heat inside; in summer it extracts indoor heat and pumps it outside, functioning as an ultra-high-efficiency central air conditioner.