I agreed: if your furnace is 2 stage with brushless DC blower motor (aka variable speed), then a 2-stage air conditioner is a must on these situations. If your furnace isn't like I described, then I would seriously think of upgrading to that, or having the blower motor replaced with one (there are replacement motors that do this very well). The advantages are not only in added comfort and humidity levels, but in energy savings too. By far, the greatest payback is with a brushless DC motor: the cost of electricity coupled with the low operating costs of the motor far exceed the energy savings from any other upgrade you can do to your home HVAC system. In fact, even if you have a relatively new furnace, the savings will exceed any kind of guaranteed return on investment available today (GICs, T-bills, etc...).
Putting people and solutions together since 1995
Need quick advice? Email me at RFDfanOttawa@gmail.com