I've got a 20yr old 2 story house with basement. Probably over 4,000sf with the finished basement. I've got two high efficiency natural gas heaters, but unlike most setups, they are not dedicated to the first and second floors.... instead they split the house side by side.
I don't know how 'tight' the house is really. Newer double pane windows and sliding doors. Replaced the weather stripping around my drafty front door before winter hit. Attic has one of those insulated zippered covers over the ladder. Nothing seems drafty, but who knows how well sealed things like recessed lights are.
Anyway, what I do know is that my house is dry, at least it seems like it. My wife and son have been getting nosebleeds, my skin is crazy-dry.
So, my questions....
1. Is there an inexpensive device for measuring humidity? I don't want to spend $80 on some professional tool that is accurate to .1 %. I'd spend $14 to get within a 1% or 2%.
2. Should I be looking at a whole house humidifier solution? There is an OLD Aprilaire unit on the RIGHT side blower, but none on the left. It doesn't appear to be working and was last serviced in 2003 (we bought in 2011 and installed 2 new complete HVAC units - blower, coils and condenser).
3. Because of the configuration of the LEFT blower, it may not be possible to mount a bypass or powered unit on either supply or return (which is probably why there's a humidistat mounted but no humidifier). Can a single humidifier unit be mounted on the RIGHT side unit and function for the whole house?
I'm sure I'll have follow-up questions.... but thanks in advance.
[Southeastern PA, 2 story house, walkout finished basement, wood frame, stucco exterior, Attic. Built 1992]