window caulk savings calculations

these calculations display your estimated savings based on assumptions below

for customized calculations enter your own data in the green fields

without weatherization
length to caulk ft
region



cooling degree days CDD
heating degree days HDD
Heating Seasonal Performance Factor (HSPF) BTU/(W hr)
Seasonal Energy Efficiency Rating (SEER) BTU/(W hr)
Annual Fuel Utilization Efficiency (AFUE) %
type of heater

cost per kilowatt hour
cost per therm
cost per CCF
cost per cubic meter
1 CCF = 103,100 BTU = 1.031 therm
1 m3 = 35.31 ft3 = 0.3531 CCF

how your savings are calculated

step 1 determine infiltration

2.355 crack coefficient x 16 ft x .01^.67 inches of water = 1.7 CFM without weatherization

1.536 crack coefficient x 16 ft x .01^.67 inches of water = 1.1 CFM with weatherization

step 2 determine savings

1.7 CFM without weatherization - 1.1 CFM with weatherization = 0.6 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 0.6 CFM x 24 hrs/day x 60 min/hr = 33,727 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 0.6 CFM x 24 hrs/day x 60 min/hr = 48,944 BTUs

step 5 determine cooling utility used cool air

33,727 BTUs / 15 SEER (BTU/W hr) / 1,000 W/kW = 2.2 kWh per year

step 6 determine heating utility used heat air

48,944 BTUs / 8.2 HSPF (BTU/W hr) / 1,000 W/kW = 6.0 kWh per year

step 7 determine cooling savings

2.2 kWh x $0.118 = $0.27 per year

step 8 determine heating savings

6.0 kWh x $0.118 = $0.70 per year

step 9 determine total savings

2.2 kWh cooling + 6.0 kWh heating = 8.2 kWh total savings per year

$0.27 cooling + $0.70 heating = $0.97 total savings per year

8.2 kWh x 15 = 123.3 kWh lifetime savings

$0.97 x 15 = $14.54 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.