Greensaver initially came to check out our attic as part of an energy audit. They told us we had an attic with a R-value of about 25 and that we would see some improvement in energy savings if we increased the insulation to R-50 and had some sealing work done at the same time. We had the work done and we can't believe the difference. Our 2nd floor is 2 degrees warmer than before so we can lower the temperature on our thermostat for the whole house! Greensaver's work went beyond other companies quotes who only wanted to blow in insulation - the spent a lot of time sealing all the leaks which is just as important. Also, they charged us $400 less than initially estimated! Thanks Greensaver!