Smart Home Device Energy Savings Calculator
ANA›Life Services Authority›National Calculator Authority›Smart Home Device Energy Savings Calculator
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Smart Home Device Energy Savings Calculator
Estimate your annual energy and cost savings by switching to smart home devices including smart thermostats, smart plugs, and LED lighting.
### Electricity Rate
Electricity Rate ($/kWh)
### Smart Thermostat
Current Annual HVAC Energy Use (kWh/year)
Expected HVAC Savings (%)
### Smart Plugs / Standby Power Reduction
Total Standby/Idle Power of Devices (Watts)
Hours per Day Devices Are in Standby
Smart Plug Standby Reduction (%)
### LED Smart Lighting
Number of Bulbs Replaced with Smart LED
Old Bulb Wattage (Watts each)
New Smart LED Wattage (Watts each)
Average Daily Usage per Bulb (hours/day)
Additional Savings from Dimming/Scheduling (%)
Calculate Savings
function smaCalc() { // --- Inputs --- var rate = parseFloat(document.getElementById('sma-rate').value); var hvacKwh = parseFloat(document.getElementById('sma-hvac-kwh').value); var thermoSavPct = parseFloat(document.getElementById('sma-thermostat-savings').value); var standbyWatts = parseFloat(document.getElementById('sma-standby-watts').value); var standbyHours = parseFloat(document.getElementById('sma-standby-hours').value); var plugSavPct = parseFloat(document.getElementById('sma-plug-savings').value); var bulbs = parseFloat(document.getElementById('sma-bulbs').value); var oldWatts = parseFloat(document.getElementById('sma-old-watts').value); var newWatts = parseFloat(document.getElementById('sma-new-watts').value); var lightHours = parseFloat(document.getElementById('sma-light-hours').value); var dimmingSavPct = parseFloat(document.getElementById('sma-dimming-savings').value);
// --- Validation --- var errors = []; if (isNaN(rate) || rate 50) errors.push("Thermostat savings must be between 0% and 50%."); if (isNaN(standbyWatts) || standbyWatts 24) errors.push("Standby hours must be between 0 and 24."); if (isNaN(plugSavPct) || plugSavPct 100) errors.push("Smart plug savings must be between 0% and 100%."); if (isNaN(bulbs) || bulbs = oldWatts) errors.push("New LED wattage should be less than old bulb wattage."); if (isNaN(lightHours) || lightHours 24) errors.push("Light usage hours must be between 0 and 24."); if (isNaN(dimmingSavPct) || dimmingSavPct 50) errors.push("Dimming savings must be between 0% and 50%.");
if (errors.length > 0) { document.getElementById('sma-result').style.display = 'block'; document.getElementById('sma-result').innerHTML = '' + errors.join('') + ''; return; }
// --- Formulas ---
// 1. Smart Thermostat Savings // kWh_saved_thermostat = hvacKwh * (thermoSavPct / 100) var thermoKwhSaved = hvacKwh * (thermoSavPct / 100); var thermoCostSaved = thermoKwhSaved * rate;
// 2. Smart Plug / Standby Savings // Annual standby kWh = (standbyWatts / 1000) * standbyHours * 365 // kWh_saved_plug = annualStandbyKwh * (plugSavPct / 100) var annualStandbyKwh = (standbyWatts / 1000) * standbyHours * 365; var plugKwhSaved = annualStandbyKwh * (plugSavPct / 100); var plugCostSaved = plugKwhSaved * rate;
// 3. Smart LED Lighting Savings // Base kWh saved from wattage reduction: // kWh_saved_base = bulbs * ((oldWatts - newWatts) / 1000) * lightHours * 365 // Additional savings from dimming/scheduling applied to new LED consumption: // newLEDkWh = bulbs * (newWatts / 1000) * lightHours * 365 // kWh_saved_dimming = newLEDkWh * (dimmingSavPct / 100) // Total lighting savings = kWh_saved_base + kWh_saved_dimming var lightKwhSavedBase = bulbs * ((oldWatts - newWatts) / 1000) * lightHours * 365; var newLEDkWh = bulbs * (newWatts / 1000) * lightHours * 365; var lightKwhSavedDimming = newLEDkWh * (dimmingSavPct / 100); var lightKwhSaved = lightKwhSavedBase + lightKwhSavedDimming; var lightCostSaved = lightKwhSaved * rate;
// 4. Totals var totalKwhSaved = thermoKwhSaved + plugKwhSaved + lightKwhSaved; var totalCostSaved = thermoCostSaved + plugCostSaved + lightCostSaved;
// CO2 savings: US average 0.386 kg CO2 per kWh (EPA 2023) var co2Saved = totalKwhSaved * 0.386;
// --- Output --- var html = '### Your Estimated Annual Savings '; html += ''; html += 'Device Category' + 'kWh Saved' + 'Cost Saved';
html += '🌡️ Smart Thermostat' + '' + thermoKwhSaved.toFixed(1) + ' kWh' + '$' + thermoCostSaved.toFixed(2) + '';
html += '🔌 Smart Plugs (Standby)' + '' + plugKwhSaved.toFixed(1) + ' kWh' + '$' + plugCostSaved.toFixed(2) + '';
html += '💡 Smart LED Lighting' + '' + lightKwhSaved.toFixed(1) + ' kWh' + '$' + lightCostSaved.toFixed(2) + '';
html += '' + '✅ Total Annual Savings' + '' + totalKwhSaved.toFixed(1) + ' kWh' + '$' + totalCostSaved.toFixed(2) + ''; html += '';
html += '🌿 CO₂ Emissions Avoided: ' + co2Saved.toFixed(1) + ' kg/year (' + (co2Saved / 1000).toFixed(3) + ' metric tons/year)
';
html += '📅 5-Year Cumulative Savings: $' + (totalCostSaved * 5).toFixed(2) + ' | ' + (totalKwhSaved * 5).toFixed(0) + ' kWh
';
html += '📅 10-Year Cumulative Savings: $' + (totalCostSaved * 10).toFixed(2) + ' | ' + (totalKwhSaved * 10).toFixed(0) + ' kWh
';
document.getElementById('sma-result').style.display = 'block'; document.getElementById('sma-result').innerHTML = html; }
#### Formulas Used
Smart Thermostat Savings: kWh_saved = HVAC_annual_kWh × (thermostat_savings_% ÷ 100)
Smart Plug Standby Savings: Annual_standby_kWh = (standby_watts ÷ 1000) × standby_hours_per_day × 365 kWh_saved = Annual_standby_kWh × (plug_savings_% ÷ 100)
Smart LED Lighting Savings: kWh_saved_base = bulbs × ((old_watts − new_watts) ÷ 1000) × hours_per_day × 365 kWh_saved_dimming = (bulbs × (new_watts ÷ 1000) × hours_per_day × 365) × (dimming_% ÷ 100) Total_lighting_kWh_saved = kWh_saved_base + kWh_saved_dimming
Cost Savings: Cost_saved ($) = Total_kWh_saved × electricity_rate ($/kWh)
CO₂ Avoided: CO₂_saved (kg) = Total_kWh_saved × 0.386 kg CO₂/kWh
#### Assumptions & References
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