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SEER / EER / SEER2 Efficiency Savings Estimator

Compare legacy and upgraded air conditioner efficiency ratings to project seasonal kWh consumption, utility bill savings, and 2023 DOE regional compliance status with live SEER-to-SEER2 cross-conversion.

SEER / EER / SEER2 Efficiency Inputs

Active Efficiency Mode

Structural Asset Metrics

Equipment Efficiency Comparison

Equivalent Legacy Rating: ~15.9 SEER

Live Results

Projected Financial Returns

$284.21 / year

Annual Energy Savings

Direct Energy Consumption Tracking

Annual Power Consumption: 5,052.6 kWh (Old) vs. 3,157.9 kWh (New)

Operational Seasonal Utility Cost

Seasonal Operating Cost: $757.89 (Old) vs. $473.68 (New)

Old Unit$757.89
New Unit$473.68

High-Efficiency Tier Comfort — Upgraded configuration significantly reduces grid load factors. Expect reliable utility bill relief and excellent thermal lifecycle management.

How to Use This SEER / SEER2 Efficiency Savings Estimator

  1. Select an efficiency rating mode. Choose SEER Mode for legacy ratings, SEER2 Mode for 2023 DOE test-procedure ratings (default), or EER Mode for steady-state peak efficiency comparisons.
  2. Enter structural asset metrics. Input conditioned property area in square feet, estimated annual cooling runtime hours, and your local utility electricity rate in dollars per kWh.
  3. Compare existing and proposed equipment ratings. Enter the existing legacy unit rating and the proposed upgraded unit rating in the active mode's units. Cross-conversion helper text appears below for SEER and SEER2 modes.
  4. Review projected savings and compliance. The Live Results panel shows annual energy savings, kWh consumption comparison, seasonal operating costs, a side-by-side cost bar chart, and a RED/YELLOW/GREEN/BLUE DOE compliance badge for the proposed unit.

Formulas & Example

Seasonal electrical consumption ties conditioned floor area, cooling runtime hours, and efficiency ratings into a direct operating cost comparison between existing and proposed equipment.

System Hourly Capacity (BTU/hr) = floor area (sq ft) × 20

Annual kWh = (system hourly capacity × annual cooling hours) ÷ (efficiency × 1,000)
Seasonal Cost = annual kWh × electricity rate ($/kWh)
Annual Savings = max(0, old cost − new cost)

SEER ↔ SEER2 conversion:
  SEER2 = SEER × 0.953
  SEER  = SEER2 ÷ 0.953

DOE compliance (proposed unit):
  RED    → SEER2 < 13.4 or legacy SEER < 14.0
  BLUE   → ≥ 18.0, or SEER2 ≥ 17.1
  GREEN  → ≥ 15.0
  YELLOW → baseline standard otherwise

Worked Example

2,000 sq ft home, 1,200 cooling hours, $0.15/kWh, upgrading from 9.5 SEER2 to 15.2 SEER2:

Capacity = 2,000 × 20 = 40,000 BTU/hr

Old kWh = (40,000 × 1,200) ÷ (9.5 × 1,000) = 5,052.6 kWh
New kWh = (40,000 × 1,200) ÷ (15.2 × 1,000) = 3,157.9 kWh

Old cost = 5,052.6 × $0.15 = $757.89
New cost = 3,157.9 × $0.15 = $473.68
Annual savings = $284.21

15.2 SEER2 ≥ 15.0 → GREEN high-efficiency badge

Frequently Asked Questions

How is annual cooling energy consumption calculated?▾
The calculator assumes a standard 20 BTU/hr heat gain baseline per square foot to derive system hourly capacity: floor area × 20 BTU/hr. Annual kWh equals (system hourly capacity × annual cooling hours) ÷ (efficiency rating × 1,000). Operating cost is kWh multiplied by your local electricity rate.
What is the difference between SEER, SEER2, and EER?▾
SEER (Seasonal Energy Efficiency Ratio) is the legacy seasonal rating under the pre-2023 test procedure. SEER2 applies the updated DOE test conditions and typically reads about 4.7% lower than legacy SEER (SEER2 ≈ SEER × 0.953). EER (Energy Efficiency Ratio) measures steady-state efficiency at a fixed outdoor temperature and is commonly used for commercial and peak-load analysis.
How do I convert between SEER and SEER2?▾
Approximate conversions used in this tool: SEER2 = SEER × 0.953, and SEER = SEER2 ÷ 0.953. For example, a 16.0 SEER unit is roughly equivalent to 15.2 SEER2. Always confirm the exact rating on the manufacturer's energy guide label.
What do the compliance badges mean?▾
Red indicates the proposed unit falls below current DOE minimums (below 13.4 SEER2 or 14.0 legacy SEER). Yellow marks baseline standard efficiency. Green indicates mid-tier high efficiency (15.0 or above). Blue marks premium variable inverter tier equipment (18.0+ or 17.1+ SEER2).
Why does the calculator use 20 BTU/hr per square foot?▾
Twenty BTU/hr per square foot is a common rule-of-thumb cooling load baseline for residential sizing estimates. It provides a consistent hourly capacity anchor for comparing efficiency upgrades without requiring a full Manual J load calculation. For precise equipment sizing, use a dedicated load calculation tool.

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