2,000 sq ft x 8 ft ceilings = 16,000 cubic feet volume inside the house
16,000 cu ft x 1.5 volumes/hour (ACH) = 24,000 cubic feet per hour
24,000 / 60 minutes per hour = 400 CFM of infiltration
Step 2 determine infiltration due to unsealed chimney
400 CFM x 10% air leakage waste due to unsealed ducts = 40 CFM
Step 3 determine cooling energy
0.081 density of air (lb/cu ft) x 0.240 heat capacity of air (BTU/lb °F) x 2008 CDD (°F day) x 40 CFM x 24 hrs/day x 60 min/hr = 2,248,446 BTUs
Step 4 determine heating energy
0.081 density of air (lb/cu ft) x 0.240 heat capacity of air (BTU/lb °F) x 2914 HDD (°F day) x 40 CFM x 24 hrs/day x 60 min/hr = 3,262,934 BTUs
Step 5 determine cooling utility used cool air
2,248,446 BTUs / 15 SEER (BTU/W hr) / 1,000 W/kW = 149.9 kWh per year
Step 6 determine heating utility used heat air
3,262,934 BTUs / 8.2 HSPF (BTU/W hr) / 1,000 W/kW = 397.9 kWh per year
Step 7 determine cooling savings
149.9 kWh x $0.118 = $17.69 per year
Step 8 determine heating savings
397.9 kWh x $0.118 = $46.95 per year
Step 9 determine total savings
149.9 kWh cooling + 397.9 kWh heating = 547.8 kWh total savings per year
$17.69 cooling + $46.95 heating = $64.64 total savings per year
547.8 kWh x 15 = 8,217.2 kWh lifetime savings
$64.64 x 15 = $969.63 lifetime savings
Savings calculations are presented as an example of potential savings; actual savings may vary based on use, utility rates and other factors.
Calculations are based on national averages and assumptions and may be adjusted for a more accurate estimate of individual savings.
While EnergyEarth strives to provide the most accurate information, we cannot guarantee the savings displayed.