The FAC (Furnaces with Air Conditioning) models modulate both on heating and cooling. There are two sensors that measure the temperature of the air being distributed to the home. This graphic depicts the FanHandler's response to heating supplied temperatures.
The air conditioning action is the other portion of the FAC's capability. It reacts to cooling temperature output but holds tightly to the humidity removal portion of the heat. The air conditioning compressor looks at moisture removal and temperature reduction as the same thing. It doesn't know the difference between the two. That is where the FanHandler outperforms anything on the market. It automatically adjusts the sensible to latent heat ratio so that it is balanced towards humidity reduction until the humidity is reduced.
NEVER A COLD DRAFT !
The FanHandler measures the temperature of the air being delivered to your home and adjusts your blower's output so that you won't feel a cold draft. 75 degree air is warm if it is standing still. However, if you move that same 75 degree air at full blower speed, it is a cold draft.
STOP THAT FAN FROM BANGING ON AND OFF
If you are fed-up with that blower banging on and off and that noisy operation, you don't need a new furnace. All you need is the FanHandler to upgrade your present furnace. The FanHandler eliminates those cold drafts that you feel when the blower first comes on. You'll enjoy smooth, draft-free comfort throughout your home.
WARM UP THOSE COLD ROOMS
When your present blower shuts off, cold air falls to the floor and races down stairways. The warm air rises to the ceiling and to upper floors in split-level and two story homes while the lower levels freeze. Each room in your home looses or gains heat at a different rate. When your blower bangs on and off, there isn't enough time during the on-periods to heat those rooms that are losing the most heat. Some rooms are warm and the ones that are cold can't catch up.
A room on the sunny side of the house gains heat while rooms on the shady side of the house lose heat. That is another reason why you have cold rooms. The FanHandler keeps the air gently moving and mixing so that temperatures level-out from room to room. It doesn't take a high speed blower to do this job. It takes a FanHandler. It's like Italian dressing. You have to shake it to mix it up. Once you've got it mixed-up, you only have to jiggle it to keep it mixed.