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HVAC Guru
HVAC Guru, HVAC TECH
Category: HVAC
Satisfied Customers: 13986
Experience:  15yrs in the HVAC industry with certificates and degrees.
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Why could humidity in home be around 70% with HVAC (new

Customer Question

Why could humidity in home be around 70% with HVAC (new system) running constantly?
Exhaust fans are being used properly, new home, no leaks, dryer vented properly, etc.
Submitted: 4 months ago.
Category: HVAC
Expert:  HVAC Guru replied 4 months ago.

Hello and thanks for using this service, if you have been waiting do not worry or get upset. I am Appliance Guru an extremely experienced tech on the site and I try to get to as many customers as I can. I just picked up your question now. NOTE it takes time for me to type research and add links so please wait for me to respond back I can only do this so fast. Secondly I am not paid anything until you rate my service good using the STAR RATING LINK at the top of your page, the money is paid to the site not me directly.

What inside temp is it keeping?

Customer: replied 4 months ago.
72 to 74
Expert:  HVAC Guru replied 4 months ago.

OK is it maintaining those temps easy and what size house and what ton unit?

Customer: replied 4 months ago.
2200 sf 2 story.
I think 2.5 lower 2 upper
Expert:  HVAC Guru replied 4 months ago.

So there are two units?

Customer: replied 4 months ago.
Expert:  HVAC Guru replied 4 months ago.

OK are both running fine? Also is it holding temps good?

Customer: replied 4 months ago.
Expert:  HVAC Guru replied 4 months ago.

OK there is no reason the humidity should be that high have you had the pressures checked on both units lately?

Customer: replied 4 months ago.
Tech says there's no problem with units
Expert:  HVAC Guru replied 4 months ago.

Does it feel muggy in the house?

Customer: replied 4 months ago.
No
Expert:  HVAC Guru replied 4 months ago.

Have you tried a different humidity monitor? Maybe it is off?

Customer: replied 4 months ago.
Tried 2 different units plus owner bought his own.
Expert:  HVAC Guru replied 4 months ago.

Can you pull the house down to 68 or will it not go that low?

Customer: replied 4 months ago.
Don't know haven't tried
Expert:  HVAC Guru replied 4 months ago.

Ok try that and see if that changes the humidity and post back to me please.

Customer: replied 4 months ago.
Owner just advised he set temp to 67 yesterday and humidity stayed same.
Expert:  HVAC Guru replied 4 months ago.

Typically that would be a home that is not tightly sealed or does not have good insulation and is getting more outside air than the system can dehumidify. For those cases they would need an additional dehumidifier to run to help drop the level there is not much more that can be done for that issue.

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