Calculator Inputs
Formula Used
SEER means seasonal energy efficiency ratio. It compares seasonal cooling output in BTU with electric energy input in watt hours.
Adjusted load = Cooling capacity × Load factor ÷ (1 − Duct loss).
Operating watts = Adjusted BTU per hour ÷ SEER.
Annual kWh = Operating watts × Annual cooling hours ÷ 1000.
Annual cost = Annual kWh × Electricity rate.
Energy savings = Current annual kWh − Proposed annual kWh. Cost savings = Current annual cost − Proposed annual cost.
Approx seasonal COP = SEER ÷ 3.412. This is only an estimate because SEER is seasonal.
How to Use This Calculator
- Enter the heat pump cooling capacity in BTU per hour.
- Add your estimated yearly cooling hours.
- Enter your electricity price per kilowatt hour.
- Type the current SEER and the proposed SEER.
- Use load factor for partial seasonal use.
- Add duct loss when air delivery is not perfect.
- Enter upgrade cost, maintenance savings, and rate increase.
- Press calculate. Review the result below the header.
- Use CSV or PDF buttons to save the result.
Example Data Table
| Capacity | Hours | Rate | Current SEER | Proposed SEER | Current kWh | Proposed kWh | Yearly Savings |
|---|---|---|---|---|---|---|---|
| 36,000 BTU/h | 1,100 | $0.16 | 10 | 18 | 3,960 | 2,200 | $281.60 |
| 24,000 BTU/h | 900 | $0.14 | 12 | 20 | 1,800 | 1,080 | $100.80 |
| 48,000 BTU/h | 1,300 | $0.18 | 11 | 19 | 5,673 | 3,284 | $430.02 |
Heat Pump SEER Planning Guide
Overview
A heat pump can cool a home with less energy than many older systems. The SEER rating helps compare that cooling efficiency. A higher value means more cooling output for each watt hour. This calculator turns that rating into yearly energy use and cost. It also compares an existing unit with a planned upgrade.
Why SEER Matters
SEER stands for seasonal energy efficiency ratio. It is based on cooling output divided by electric energy used across a season. Two systems can have the same capacity but different operating costs. The unit with the higher SEER should use fewer kilowatt hours for the same cooling load. That difference becomes important when summer hours are long or power prices are high.
Using Better Inputs
Good inputs make better estimates. Start with the rated cooling capacity in BTU per hour. Enter yearly cooling hours from bills, a thermostat report, or a local climate estimate. Add the electric rate from your utility bill. Include duct loss when air leaks, insulation is weak, or ducts pass through hot spaces. Use the load factor when the system rarely runs at full output.
Reading the Results
The result shows estimated watts, yearly kilowatt hours, yearly cost, and savings. It also gives the SEER gain and an approximate seasonal COP. The lifetime section applies price escalation and extra maintenance savings. Payback is shown when upgrade cost and savings are both positive. If payback is not shown, the input values may describe no financial recovery.
Smart Upgrade Choices
SEER is useful, but it is not the only factor. Comfort, humidity control, noise, installation quality, refrigerant condition, and duct design also matter. A right sized unit may outperform a poorly installed high rating system. Use this tool for screening options. Then confirm final sizing and equipment selection with a qualified technician.
Important Limits
This estimate is not a laboratory certificate. Weather changes, occupant behavior, filters, coil cleanliness, and thermostat setbacks can change real use. SEER also focuses on cooling season performance. Heating performance uses other ratings. Keep records after installation. Compare future bills with similar weather months. That habit helps verify savings and find service issues early. It also supports better replacement planning next season.
FAQs
What does SEER mean?
SEER means seasonal energy efficiency ratio. It compares cooling output with electric energy use across a cooling season. A higher number usually means lower cooling energy use.
Can this calculator compare two heat pumps?
Yes. Enter the current SEER and the proposed SEER. The tool compares watts, yearly energy use, annual cost, and savings for both systems.
What is annual cooling hours?
Annual cooling hours estimate how long the system runs during a year. Use utility data, smart thermostat reports, local climate records, or a practical estimate.
Why include duct loss?
Duct loss raises the delivered cooling requirement. Leaky or hot ducts can make the unit work harder. Enter a percentage when air delivery is not ideal.
Is COP the same as SEER?
No. COP is a ratio of heat movement to electric power. The calculator gives an approximate seasonal COP by dividing SEER by 3.412.
What is the SEER2 factor?
The SEER2 factor gives a rough conversion estimate. Actual certified ratings depend on official testing. Use the manufacturer rating for final decisions.
Why is payback not shown sometimes?
Payback appears only when savings can recover the extra upgrade cost. If savings are low, zero, or negative, the tool marks payback as not reached.
Can this replace a contractor estimate?
No. It is a planning tool. Final sizing, duct review, installation details, and equipment selection should be checked by a qualified HVAC professional.