Just had a 5 ton Infinity 16 heat pump installed with zoning. We have had very mild weather (highs in the low 80's) lately here in Orlando and the system has yet to jump into high cooling stage, so I am always running low cooling stage which is 3 tons, 1050 CFM or less. I find that I have to turn the thermostats really low to get comfortable (74 deg in certain zones). Also there are very cold drafts drafts and the floor is really cold, I am assuming this is due to the fact that the air flow velocities are at 50% of design and register throw is significantly reduced. Is this a common problem of 2 stage, variable speed setups? It seems like the cold air is not mixing very well.
The best mixing seems to occur in the areas of the house with 12 foot ceilings. It is very comfortable in that zone with a thermostat setting of 77 deg. The rest of the house has 10 foot ceilings.
[Edited by eberrong on 11-06-2006 at 12:56 PM]