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HVAC Energy Savings Calculator

Estimate how much a SEER / SEER2 upgrade saves. Example: a 3-ton, 10 SEER AC running 1,000 hours at $0.16/kWh uses about 3,600 kWh; upgrading to 18 SEER cuts that to 2,000 kWh — $256 saved per year (44% less energy). Enter your numbers for the dollar and payback estimate.

Calculator

Enter your current and planned SEER, system size, how many hours it runs each year, and your electricity rate. Add the extra equipment cost for a simple payback estimate.

On the outdoor unit nameplate. After 2023 it may be labeled SEER2 (subtract about 1 point).
The SEER of the replacement unit. Minimums: 14 SEER north / 15 SEER south (U.S., 2023+).
1 ton = 12,000 BTU/h of cooling. Typical home central AC is 2–5 tons.
How many hours the AC cools each year. Hot climates often exceed 1,500; mild climates under 600.
Your utility price per kWh (use the higher "delivery + supply" total). U.S. average is about $0.16.
Optional. Simple payback = added cost ÷ annual dollar savings.

Tip: Change any value to instantly update the result.

About this calculator

Compare the annual cooling energy of your current air conditioner with a higher-SEER / SEER2 replacement, then turn the difference into dollars saved and a simple payback. The math uses the seasonal efficiency definition: cooling kWh = tons × 12,000 × run hours ÷ (SEER × 1,000). The same page covers SEER2 and payback, so searches for SEER energy savings calculator or AC savings calculator both land here. Need a quick lookup? See the SEER upgrade savings reference below. More HVAC tools: HVAC calculators hub. Sizing next? Use the HVAC capacity calculator or the duct size calculator.

  • Estimate the energy and dollar impact of a SEER upgrade before you get a contractor quote.
  • See whether a higher-SEER unit pays back in your climate and run hours.
  • Convert a SEER2 label to the equivalent SEER for an apples-to-apples comparison.
  • Check the percent energy reduction from 1 − (old SEER ÷ new SEER).

Calculation Results

$256saved per year
A 3-ton AC at 10 SEER → 18 SEER, running 1,000 h/yr at $0.16/kWh, saves about 1,600 kWh and $256/year (44% less energy).
Default preview — updates when you change inputs.

Annual cooling kWh = tons × 12,000 × run hours ÷ (SEER × 1,000). Savings = (kWh at old SEER − kWh at new SEER) × rate.

Estimating disclaimer

This calculator gives a screening estimate using nameplate SEER, assumed run hours, and your rate. Actual savings depend on climate, duct losses, thermostat setpoints, and whether the old unit was properly sized. For a final decision, combine this estimate with a load calculation and contractor quotes.

SEER Upgrade Savings Reference

Annual kWh and dollars saved for a 3-ton AC running 1,000 h/yr at $0.16/kWh when upgrading from a baseline SEER to a higher one. The calculator handles any size, hours, and rate.

Energy and dollar savings versus current SEER (3 ton, 1,000 h/yr, $0.16/kWh)
From → To SEERkWh saved/yr$ saved/yr% less energy
10 → 14771$12329%
10 → 161,143$18343%
10 → 181,600$25644%
13 → 18728$11628%
13 → 201,038$16635%
14 → 20686$11030%

Formula & How It Works

SEER is cooling output ÷ energy input over a simulated season, so a higher SEER delivers the same cooling with less electricity. Convert the rating into annual energy use, then compare.

Annual cooling energy

\\[ \\text{kWh}_{\\text{yr}} = \\frac{\\text{tons} \\times 12{,}000 \\times \\text{run hours}}{\\text{SEER} \\times 1{,}000} \\]

Savings

\\[ \\text{kWh saved} = \\text{kWh}_{\\text{old}} - \\text{kWh}_{\\text{new}}, \\quad \\$ saved = \\text{kWh saved} \\times \\text{rate} \\]

Percent energy reduction

\\[ \\% \\text{ saved} = \\left(1 - \\frac{\\text{SEER}_{\\text{old}}}{\\text{SEER}_{\\text{new}}}\\right) \\times 100 \\]

Example: 3 tons at 1,000 h/yr → 3 × 12,000 × 1,000 ÷ (10 × 1,000) = 3,600 kWh at 10 SEER; at 18 SEER it is 2,000 kWh. The 1,600 kWh difference × $0.16 = $256/year, a 44% reduction.

Frequently Asked Questions

How much can I save by upgrading my AC SEER?

Energy saved scales with 1 minus the ratio of old SEER to new SEER. Moving from a 10 SEER unit to an 18 SEER unit cuts cooling energy by about 44 percent. Dollar savings are that percentage of your current annual cooling kWh times your electricity rate.

What is SEER and SEER2?

SEER (Seasonal Energy Efficiency Ratio) is cooling output in BTU divided by energy input in watt-hours over a simulated season. SEER2 is the 2023 update with a more realistic test that yields slightly lower numbers for the same equipment; a 14 SEER unit is roughly a 13.4 SEER2 unit.

How do I calculate energy savings from SEER?

Annual cooling kWh = (system tons × 12,000 × run hours) ÷ (SEER × 1,000). Compute it at the old and new SEER, subtract, and multiply the difference by your electricity rate. Percent saved = 1 − (old SEER ÷ new SEER).

How do I find my air conditioner's SEER?

The SEER is on the outdoor unit nameplate and the yellow EnergyGuide sticker. For systems installed after 2023 the label may show SEER2; convert by subtracting about 0.8 to 1.0 SEER2 point to estimate the equivalent SEER.

What is a good SEER for a new AC?

As of 2023 the U.S. minimum is 14 SEER (13.4 SEER2) in the north and 15 SEER (14.3 SEER2) in the south. Mid-efficiency 16–18 SEER and high-efficiency 20–22 SEER units are common; higher SEER costs more upfront, so compare against your climate and run hours.

Does a higher SEER always pay back?

Not always. Higher SEER equipment costs more, and in mild climates with few cooling hours the extra efficiency may take many years to recover. Use the payback line in this calculator: payback years = added equipment cost ÷ annual dollar savings.

What is the difference between SEER and HSPF?

SEER measures cooling efficiency; HSPF (Heating Seasonal Performance Factor) measures heat-pump heating efficiency. A heat pump has both ratings, and a higher number is better for each.

Can I use this as an energy savings calculator for my home?

Yes. Enter your current and planned SEER, system size and run hours, and your electricity rate. The tool estimates annual kWh and dollar savings and simple payback; it is a screening estimate, not a substitute for a load calculation or contractor quote.

Review & sources

Reviewed: CalcPanel HVAC Engineering Team

Updated: 2026-10-19

Reference