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Started By
Message
Brand new built home has high humidity. Normal?
Posted on 6/1/26 at 3:16 pm
Posted on 6/1/26 at 3:16 pm
Just moved in recently. It’s a new build.
The hvac is all brand new and does cool down fine. However, the humidity on my thermostat app is showing 65% which seems high and makes it a little uncomfortable.
I’ve seen that this may be normal because materials from the build are drying out?
Anyone ever dealt with this?
This is my first new build home.
Also, thanks for everyone for the washer, dryer, fridge, and tv recs!
The hvac is all brand new and does cool down fine. However, the humidity on my thermostat app is showing 65% which seems high and makes it a little uncomfortable.
I’ve seen that this may be normal because materials from the build are drying out?
Anyone ever dealt with this?
This is my first new build home.
Also, thanks for everyone for the washer, dryer, fridge, and tv recs!
7
Posted on 6/1/26 at 3:19 pm to King of New Orleans
Is it sealed up tightly with a lot of spray foam insulation?
Posted on 6/1/26 at 3:20 pm to GoAwayImBaitn
Yes
Posted on 6/1/26 at 3:21 pm to King of New Orleans
Check pan under air handler, if it’s holding water there’s your humidity problem. We basically rebuilt after Laura and my hvac guys had the pan level and it wouldn’t drain.
Posted on 6/1/26 at 3:24 pm to King of New Orleans
you probably have too big of an ac unit in a too good of insulated house. unit isn't running long enough to get to your cool down temps. may have to add a dehumidifier to your system.
Posted on 6/1/26 at 3:25 pm to KemoSabe65
If the pan had water the system wouldn’t turn on though. It’s a brand new system.
Posted on 6/1/26 at 3:25 pm to King of New Orleans
quote:
Yes
Your HVAC may not be properly designed. Do some research on dehumidification and ventilation...also the tonnage of an AC system for a spray foam house is different
Posted on 6/1/26 at 3:26 pm to Chad504boy
quote:
unit isn't running long enough to get to your cool down temps
The thermostat says it’s getting down to what I set it to. The system is working fine, it’s just the humidity.
Posted on 6/1/26 at 3:28 pm to King of New Orleans
quote:
The thermostat says it’s getting down to what I set it to.
its getting to your temps too fast. house ac units need to run for extended period of time to condition the humidity properly out of your house.
your house is insulated too well and your ac tonnage is probably too much for your foam insulated house. its a tale as old as time. you need to have your ac company address this design flaw.
quote:
The system is working fine, it’s just the humidity.
that means its not designed properly. so far from working fine. its a problem.
This post was edited on 6/1/26 at 3:32 pm
Posted on 6/1/26 at 3:35 pm to Chad504boy
Our builder said we have one free call to the ac guys to come check the circulation. I guess this would be something they could fix on the call?
Posted on 6/1/26 at 3:37 pm to King of New Orleans
quote:
Our builder said we have one free call to the ac guys to come check the circulation. I guess this would be something they could fix on the call?
who hired the ac company?
Builder or you?
was this a spec home you bought from said builder?
need tons more info. what was the role of the builder in the design of the home w/ insulation and ac design?
seems like you in for an interesting ride here. none of these assholes are going to want to assume responsibility for this design flaw.
Posted on 6/1/26 at 3:40 pm to Chad504boy
Builder hired them. Our superintendent told us they have a deal in place with the company to come for one free adjustment.
Posted on 6/1/26 at 3:44 pm to King of New Orleans
quote:
Builder hired them. Our superintendent told us they have a deal in place with the company to come for one free adjustment.
You keep thinking about this wrong.
It sure seems like you have a DESIGN issue with the home paired with your ac system. you need to read up on the louisiana home warranty act and get familiar and put on a tougher face with your builder. This is a big deal and Design flaw that needs to be remedied. This does not seem like its a "well your ac is running just fine there george" type house call needed.
Posted on 6/1/26 at 3:54 pm to King of New Orleans
You likely have an oversized unit and it is short cycling. It doesn't have time to pull moisture from the air.
You can adjust the fan speed, which will force the unit to run longer, or you can set minimum run times.
You can adjust the fan speed, which will force the unit to run longer, or you can set minimum run times.
Posted on 6/1/26 at 3:58 pm to Salmon
quote:
or you can set minimum run times
How do you do this and what would a good run time be?
Posted on 6/1/26 at 4:04 pm to King of New Orleans
quote:
How do you do this and what would a good run time be?
That is not a proper remedy to the issue.
Posted on 6/1/26 at 4:11 pm to King of New Orleans
What temp do you keep the house? Set it to 68 and see if it pulls more moisture out.
Higher than normal moisture in a new home is common but should drop the more you use the a/c. Run it cooler than normal and see if it starts dropping. If that doesn't work you can check your t-stat for a humidity setting, if it's installed right it should work. Another thing to do is check the fan speed. Some are variable and some you have to set by hand. Read the owners manual and you should find it.
Higher than normal moisture in a new home is common but should drop the more you use the a/c. Run it cooler than normal and see if it starts dropping. If that doesn't work you can check your t-stat for a humidity setting, if it's installed right it should work. Another thing to do is check the fan speed. Some are variable and some you have to set by hand. Read the owners manual and you should find it.
Posted on 6/1/26 at 4:12 pm to Chad504boy
how many tons is the system? Sq. ftg of house? used to be the rule of thumb was to undersize the A/C slightly to avoid the excess humidity
depending on the house layout, and how handy you are, it's not too difficult to come up with a tonnage recommendation on your own. i took a mechanical systems class in school once and it helped me to know the initial estimate by some young fellow was way off, on our house.. they got it right eventually though.
depending on the house layout, and how handy you are, it's not too difficult to come up with a tonnage recommendation on your own. i took a mechanical systems class in school once and it helped me to know the initial estimate by some young fellow was way off, on our house.. they got it right eventually though.
This post was edited on 6/1/26 at 4:19 pm
Posted on 6/1/26 at 4:19 pm to King of New Orleans
quote:It isn’t a circulation issue, though. It’s a design issue. When you have spray foam insulation, especially if your ceiling and/or attic are spray foam insulated, your A/C unit itself needs to be a smaller tonnage than you would have if you used traditional insulation. If the A/c unit is too big for your well-insulated home, its run cycle is too short. Sure, it cools your house super fast. That’s not a good thing, though. It needs to run longer to pull moisture out of the house. You need a smaller (properly-sized) unit installed in your home, or you need to have them install a whole-home dehumidifier. That should work also.
Our builder said we have one free call to the ac guys to come check the circulation.
Posted on 6/1/26 at 4:32 pm to King of New Orleans
I had similar issue on a major renovation. Diagnosis was over insulated attic. Added dehumidifiers in attic. Problem solved. Variable speed units weren’t enough to get it to low 50%.
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