temperatures that could be below zero and trying to get up to the correct temperature in your home or business. this means you have to pay money to get that temperature from 0 all the way up to 60 or 70. if you start with a temperature of 50-60 this process is going to be much less expensive.
now when you consider this from the other way you can see that starting at 50-60 degrees is still much lower than the outdoor temperature which could be in excess of 80 degrees. you end up getting your home or business to the temperature that you want much faster than you would in 