A particularly popular choice for HVAC applications is the bulk polymer resistive sensor, which provides a direct, secondary measurement of RH.
The location of doors, windows, electrical outlets, HVAC vents, ceiling and wall fixtures, and closets will have an impact on the type of unit that will work for you.
If you install energy efficient windows, doors, insulation, a new roof, HVAC system, or water heater, you may be eligible for up to $1,500 in tax credits.
By doing your homework and finding a reputable HVAC contractor, you can increase the chances of getting a high-quality installation that's backed up with a strong warranty.
In winter, reverse the blades and force the rising warm air coming from your HVAC system back down to the lower half of the room.