Reply to DH keeps turning off the heat

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[quote=Anonymous]1. It is a myth that turning off HVAC systems costs more money because "it takes extra effort to heat up the house"

For example: if the typical HVAC system runs 15 minutes per hour and the system is off for 8 hours at night and the temperature drops from 70 down to 55 and then it takes 45 minutes to raise the heat back up to 70 you save 75 minutes of fuel cost. That is about 37 hours of fuel cost over a month.

8hours X 15 minutes = 120 minutes per night vs. 45 minutes per morning = 75 minutes not burning fuel.

The numbers are different for each house and HVAC system based on how energy efficient the house and system is.

2. programmable thermostats can actually increase fuel usage because they do not account for daily variations in whether or not you are feeling too hot or too cold. They can certainly make life more comfortable but extra cost results from evening out the temperature variations.

Think of it like this:

cruise control on a car can help save gas while driving.... BUT... it does not save gas to leave the car running in the driveway at night because "it will take extra fuel" to get the car up to speed in the morning.

Understand that depending on the usage scenario you BOTH can be correct (or wrong).[/quote]

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