I don't know a good setting on a robertshaw 9420 thermostat, for really cold,and fast air condition.
Well Brian, an air conditioner creates the same temperature drop across the evaporator at any thermostat setpoint, so there is no setting that will get it really cold really fast. If your return air is 88 degrees (in a hot house where the system has been off) the supply air temp is going to be near 68 degrees..... as the a/c runs, the air changes within the structure cause a reduction in the average return air temperature and slowly drops the return to 87, then 86 then 85 etc, etc and the corresponding supply air temp continues to drop from 68 to 67 to 66 to 65 etc etc. Eventually the supply air temp after the appropriate 'air changes' within the structure will drop to 55 degrees and possibly even lower to satisfy the average room temp at 75, 74, 73 etc. to a point.
There are SOME newer a/cs that have two speed compressors that may effect the supply air temperature drop under differing load conditions, but thats a different ball of wax.
So, if you want it cold quickly you are out of luck, just leave the t-stat set at 70 degrees and pay the electric bill when it comes in.....
Dec 25, 2014 |