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Any HVAC Professionals?
Posted on 5/7/19 at 2:59 pm
Posted on 5/7/19 at 2:59 pm
I just built a house and the builder installed Lennox equipment.
My inside Humidity has been over 70% and it feels quite muggy inside. (I'm in Austin, TX). I got to snooping around the units and I have a 2.5 TON outdoor unit and a 4 TON indoor unit. Is it common to not having matching inside and out? Building is sending a contractor to take a look but figured i'd ask on here.
My inside Humidity has been over 70% and it feels quite muggy inside. (I'm in Austin, TX). I got to snooping around the units and I have a 2.5 TON outdoor unit and a 4 TON indoor unit. Is it common to not having matching inside and out? Building is sending a contractor to take a look but figured i'd ask on here.
5
Posted on 5/7/19 at 3:07 pm to MayhemMike
Spray foam insulation? What's the square footage?
Posted on 5/7/19 at 3:17 pm to MayhemMike
Many things could be wrong here....
first question I have is, is the 4 Ton unit just the size of the air handler or is that the size of the coil?
If that is the size of the coil, then yes that can contribute to the humidity levels because it would have very little latent cooling capacity. The interior coil won't be getting cold enough to pull moisture out of the air.
If the indoor coil is sized properly (2.5 ton) then it could be just a CFM setting issue. This would mean they have set the CFM level in the AHU too high resulting in no latent cooling capability.
EDIT: Is it common? Yes. Many times manufacturers can pair a larger interior coil with a smaller outdoor unit to increase the SEER rating. The cost of doing this is losing de-humidification capability (or latent cooling). Most of the time though you would only see a mismatch of 0.5 to 1 ton. 1.5 ton would be a drastic difference.
first question I have is, is the 4 Ton unit just the size of the air handler or is that the size of the coil?
If that is the size of the coil, then yes that can contribute to the humidity levels because it would have very little latent cooling capacity. The interior coil won't be getting cold enough to pull moisture out of the air.
If the indoor coil is sized properly (2.5 ton) then it could be just a CFM setting issue. This would mean they have set the CFM level in the AHU too high resulting in no latent cooling capability.
EDIT: Is it common? Yes. Many times manufacturers can pair a larger interior coil with a smaller outdoor unit to increase the SEER rating. The cost of doing this is losing de-humidification capability (or latent cooling). Most of the time though you would only see a mismatch of 0.5 to 1 ton. 1.5 ton would be a drastic difference.
This post was edited on 5/7/19 at 3:20 pm
Posted on 5/7/19 at 4:57 pm to MayhemMike
In addition to comments here you can post your question and get responses from multiple HVAC professionals on this site. Of course the more information you can provide, model numbers of condensing unit, evap coil in the air handler, square footage of house, etc., the better, more detailed answer they can provide.
HVAC-TALK
HVAC-TALK
Posted on 5/9/19 at 5:13 pm to MayhemMike
That's one problem. If unit is too big it doesn't run long enough to dehumidify.
Posted on 5/18/19 at 1:48 pm to MayhemMike
A classic symptom of an oversized evap coil is high humidity ! There are some possible things you can try but the best is to correct the oversized coil problem. 1.5 tons is too much !
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