I just moved in to a two story home for the first time in years. Trying to get the temp set right as we always seem to be cold downstairs. I bought a few cheap thermometers and laid one upstairs and one down. The discrepancy between the temps seems to run about four degrees. i.e If it is 73 upstairs, it is only 69 downstairs. Is this a normal disparity range, or is it likely that I have balance problems? Next week is my 21 day walkthrough with the builder and, if this is outside of the normal, acceptable range as far as the disparity goes, that will be my chance to fix it and have the system reblanced. Odds are the builder will tell me it is normal. I want to know if that is true or not.