TradeCalcs

SEER Savings Calculator — Old vs New AC Cost

Who this is for: For homeowners deciding whether a 16-SEER2 replacement justifies its premium over 14 — and contractors who'd rather show math than hand-wave 'big savings'.

Old SEER, new SEER, annual kWh and your rate in — get the new consumption, kWh saved and dollars per year.

Quick answer: SEER savings = annual kWh × (1 − old SEER ÷ new SEER) × electric rate. Going from a 10-SEER unit at 6,000 kWh/yr to a 16-SEER2 one cuts consumption 37.5% — 2,250 kWh — about $337/yr at $0.15/kWh. Enter your old unit's numbers below for your figure.

SEER2 units go here too

match the rating system

kWh

≈1,000 per ton per season

$/kWh
New annual use
3,750 kWh
was 6,000 kWh
Saved
2,250 kWh
-37.5% less power
Dollars per year
$338
@ $0.15/kWh
The math
Ratioold ÷ new = 10 ÷ 16 = 0.625
New consumption6,000 × 0.625 = 3,750 kWh
Annual savings$338
Payback = (price difference ÷ annual savings) — a $1,500 premium saving $337/yr pays back in about 4.5 cooling seasons, then compounds. Savings scale with runtime: Phoenix runs double the hours of Seattle.
Consumption scales inversely with SEER for the same cooling. SEER2 (2023+) rates the same hardware ~4.5% lower than old SEER — compare like with like.
Core facts
FormulaNew kWh = old kWh × (old SEER ÷ new SEER)
Savings(old − new kWh) × $/kWh
SEER2 noteSame hardware rates ~4.5% lower vs old SEER
kWh estimate≈1,000 kWh per ton per season (moderate climate)
ExampleSEER10 → SEER16 @ 6,000 kWh: −2,250 kWh ≈ $337/yr @ $0.15
StatusEstimating tool. Compiled September 2026.

How does SEER translate to savings?

SEER is a ratio: cooling delivered per watt-hour consumed over a season. For the same cooling, consumption scales inversely — annual kWh on the new unit = old kWh × (old SEER ÷ new SEER). Replace a 10-SEER unit burning 6,000 kWh/yr with a 16-SEER2 one and consumption falls to 3,750 kWh: 2,250 kWh saved, which at $0.15/kWh is $337 a year. Two honest caveats: first, 2023's SEER2 standard rates the same hardware about 4.5% lower than old SEER (stricter test setup), so a '14 SEER2' performs roughly like a 13.4 old-SEER — compare like with like. Second, savings scale with runtime: a lightly used system saves less than one cycling all summer in Texas. Enter your actual kWh from last year's bills (or estimate 1,000 kWh per ton per season as a starting point) for the honest number.

Common uses

  • Deciding between a 14.3 (code minimum) and 16+ SEER2 quote
  • Showing a spouse the payback math on the premium efficiency tier
  • Estimating savings after a heat-pump replacement in cooling season
  • Checking whether a high-SEER claim on a used unit passes the straight-face test

Frequently Asked Questions

What does SEER mean?
Seasonal Energy Efficiency Ratio — total cooling output over a season (BTU) divided by electricity in (watt-hours). Higher = less power for the same cooling. It's like MPG for an air conditioner, and like MPG, real-world results vary with usage.
What changed with SEER2 in 2023?
The DOE tightened the test conditions (higher external static pressure), so the same equipment scores ~4.5% lower under SEER2 than old SEER. Southeast/Southwest regions have a higher minimum (15 SEER2 / 14.3 in the South) than the North (13.4 SEER2). When comparing, keep both numbers in the same system.
How do I estimate my annual kWh?
Best: read it off bills (summer minus shoulder-month baseline). Rough: 1,000 kWh per ton per cooling season for average use, up to 1,600–2,000 in Phoenix or South Texas. A 3-ton unit in Dallas might run ~3,900 kWh/yr.
Does the calculator include demand charges or tiers?
No — it multiplies kWh by a flat rate. If your utility has time-of-use pricing, use your blended summer rate; tiered plans should use the marginal (top-tier) rate since savings come off the top.
Is a higher-SEER unit always worth it?
Not automatically — the payback is (price difference) ÷ (annual savings), and it competes with how long you'll stay in the home. The calculator gives the annual figure; the payback judgment is yours. Savings compound, though, if energy prices rise.

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