Area to be insulated 2000ft2
Unit Cost of Insulation Rs.38/ft2 (insulation only without cover)
Cost of Total Insulation Rs.76,000
To cool this space air conditioning equivalent to 10.5 tons shall be required, consuming electricity of 17.4 KWH per hour.
For 12 hour usage the consumption shall be 209 KWH.
At Rs.4 (including unit rate plus FAC) Rs.836 per day
Cost per month Rs.25,080 (30 days)
Cost per year on nine month usage Rs.225,720
Polyurethane is the world’s most efficient insulating system for roof usage and shall benefit approximately 30~40% in saving.
Assuming a minimum of 33% saving in electricity the annual saving due to roof insulation shall be Rs.74,487/=
Spent of insulation Rs.76,000 9.2 months (less then one year)
Annual Saving Rs.74,487
total recovery period for investment for polyurethane is one summer.
The above calculations are based on a comparative statement of two ideal
houses, one with Spray Polyurethane Roof Insulation
and the other one without it. Both these houses have cavity
walls and sandwiched glass windows. If
however the house does not contain these features then the improvement
in energy consumption will be lower, approaching to 20%."
Insulations (Pvt.) Ltd