SEER Rating Savings Calculator

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SEER Rating Savings Calculator

Estimate your annual electricity cost savings when upgrading from an older air conditioner to a higher SEER (Seasonal Energy Efficiency Ratio) rated unit.

Cooling Capacity (BTU/hr)

Typical home: 18,000–60,000 BTU/hr (1.5–5 tons)

Current / Old SEER Rating

Pre-2006 units are often SEER 6–10

New / Upgraded SEER Rating

Modern high-efficiency units: SEER 16–26+

Annual Cooling Hours (hrs/year)

Varies by climate: 500 (cool) – 3,000+ (hot/humid)

Electricity Rate ($/kWh)

U.S. average ≈ $0.13/kWh (check your utility bill)

Calculate Savings

function seeCalc() { var resultDiv = document.getElementById('see-result');

var coolingLoad = parseFloat(document.getElementById('see-cooling-load').value); var oldSeer = parseFloat(document.getElementById('see-old-seer').value); var newSeer = parseFloat(document.getElementById('see-new-seer').value); var hours = parseFloat(document.getElementById('see-hours').value); var rate = parseFloat(document.getElementById('see-rate').value);

// --- Input Validation --- var errors = []; if (isNaN(coolingLoad) || coolingLoad 120000) errors.push("Cooling capacity must be between 5,000 and 120,000 BTU/hr."); if (isNaN(oldSeer) || oldSeer 30) errors.push("Old SEER rating must be between 6 and 30."); if (isNaN(newSeer) || newSeer 30) errors.push("New SEER rating must be between 6 and 30."); if (!isNaN(oldSeer) && !isNaN(newSeer) && newSeer 4000) errors.push("Annual cooling hours must be between 100 and 4,000."); if (isNaN(rate) || rate 1.00) errors.push("Electricity rate must be between $0.01 and $1.00 per kWh.");

if (errors.length > 0) { resultDiv.innerHTML = ''; return; }

/ * Core Formula: * Annual Energy (kWh) = (Cooling Load in BTU/hr × Annual Hours) / (SEER × 1000) * * SEER is defined as BTU of cooling per Watt-hour of electricity consumed. * Dividing by 1000 converts Wh → kWh. * * Annual Cost ($) = Annual Energy (kWh) × Electricity Rate ($/kWh) * * Annual Savings ($) = Cost_old − Cost_new * Savings (%) = (1 − old_SEER / new_SEER) × 100 /

var energyOld = (coolingLoad * hours) / (oldSeer * 1000); // kWh/year var energyNew = (coolingLoad * hours) / (newSeer * 1000); // kWh/year var costOld = energyOld * rate; // $/year var costNew = energyNew * rate; // $/year var savings = costOld - costNew; // $/year var savingsPct = (1 - oldSeer / newSeer) * 100; // % var energySaved = energyOld - energyNew; // kWh/year

// Simple payback helper (rough estimate: $100 per SEER point per ton) var tons = coolingLoad / 12000; var upgradeEst = (newSeer - oldSeer) * 100 * tons; // rough install cost delta var payback = savings > 0 ? upgradeEst / savings : null;

resultDiv.innerHTML = '### Results ' + '' + 'MetricCurrent Unit (SEER ' + oldSeer.toFixed(1) + ')New Unit (SEER ' + newSeer.toFixed(1) + ')' + 'Annual Energy Use' + energyOld.toFixed(0) + ' kWh' + energyNew.toFixed(0) + ' kWh' + 'Annual Electricity Cost$' + costOld.toFixed(2) + '$' + costNew.toFixed(2) + '' + '' + '' + 'Annual Savings: $' + savings.toFixed(2) + ' / year

' + 'Energy Saved: ' + energySaved.toFixed(0) + ' kWh / year

' + 'Efficiency Improvement: ' + savingsPct.toFixed(1) + '%

' + (payback !== null ? 'Estimated Simple Payback: ' + payback.toFixed(1) + ' years (based on ~$' + upgradeEst.toFixed(0) + ' incremental upgrade cost)

'
'') + ''; }

#### Formula

Annual Energy Consumption (kWh/year):

Energy = (Cooling Capacity [BTU/hr] × Annual Cooling Hours) / (SEER × 1,000) Annual Operating Cost:

Cost ($) = Energy (kWh) × Electricity Rate ($/kWh) Annual Savings:

Savings ($) = Cost_old − Cost_new Percentage Savings:

Savings (%) = (1 − SEER_old / SEER_new) × 100 SEER (Seasonal Energy Efficiency Ratio) is defined as the total cooling output (BTU) divided by the total electrical energy input (Wh) over a typical cooling season. A higher SEER means less electricity consumed per BTU of cooling delivered.

#### Assumptions & References

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References

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