My heat pump is only 2 years old. It is a Lennox 13 Seer and has a variable speed air handler. It has provided adequate heat for our house but the register temperature has never been higher than 86 degrees. I mentioned this to my HVAC contractor the other day and he sent out a technician to check it. THe technician slowed down the fan by 10% and the result is that my register temperature is not about 96 degrees.
I know that the outside unit can only produce a certain amount of heat energy at the coil. By slowing the fan and allowing the air to spend more time on the coil and, thus, raising the T, will the unit operate more or less efficiently. i. e. is it going to cost more or less to heat the house.
Any thoughts will be appreciated.