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re: Any HVAC Professionals?
Posted on 5/8/19 at 9:13 am to notsince98
Posted on 5/8/19 at 9:13 am to notsince98
Good answer/nice explanation.
OP as another poster asked does your new house have spay foam insulation in attic/walls? I know we are not yet in the heat of the summer but when your HVAC runs does it cycle frequently (i.e. have short run times)? Do you know if your builder had a Manual J load calculation done ( used to size the unit) and as I understand is now required by code. You need to ask to see the manual J load calculation for your new home to see if the unit is sized correctly.
On the HVAC-TALK forum I mentioned in my earlier post, I know a common theme among the HVAC professionals is that the most common problem they encounter in poorly preforming HVAC units, including new construction, is oversized HVAC units and undersized/poorly installed duct work. And they say builders have a tendency to over-size the units even when the Manual J load calculation tells them differently.
I’ve also seen some videos on HVAC issues associated with new installs where the problem was as simple as the unit being overcharged or undercharged with refrigerant, or as mentioned by Notsince99 where the indoor air handler blower speed was/is not properly set. Sometimes it’s 2 or 3 issues acting in concert with each other. Hopefully your problem is a simple one that is easily resolved by the HVAC installer.
When you get the problem resolved bump this post and let us know that the problem was and how it was fixed.
OP as another poster asked does your new house have spay foam insulation in attic/walls? I know we are not yet in the heat of the summer but when your HVAC runs does it cycle frequently (i.e. have short run times)? Do you know if your builder had a Manual J load calculation done ( used to size the unit) and as I understand is now required by code. You need to ask to see the manual J load calculation for your new home to see if the unit is sized correctly.
On the HVAC-TALK forum I mentioned in my earlier post, I know a common theme among the HVAC professionals is that the most common problem they encounter in poorly preforming HVAC units, including new construction, is oversized HVAC units and undersized/poorly installed duct work. And they say builders have a tendency to over-size the units even when the Manual J load calculation tells them differently.
I’ve also seen some videos on HVAC issues associated with new installs where the problem was as simple as the unit being overcharged or undercharged with refrigerant, or as mentioned by Notsince99 where the indoor air handler blower speed was/is not properly set. Sometimes it’s 2 or 3 issues acting in concert with each other. Hopefully your problem is a simple one that is easily resolved by the HVAC installer.
When you get the problem resolved bump this post and let us know that the problem was and how it was fixed.
2
Posted on 5/8/19 at 9:18 am to CrawDude
That is a good point about possible oversizing. That would definitely contribute to this problem. I didn't think much about it because 2.5 ton in Austin "seems" like a relatively small unit given the hot climate.
Posted on 5/8/19 at 10:03 am to CrawDude
I can't speak for the attic but the walls have the normal strips of cotton candy insulation in them. I got a recommendation from another hvac installer about making sure they used a smaller expansion valve since they mismatched the units. It could help.
I'll let you know what the original hvac installer says when they meet with me. They are already being rude and saying the parts are correct and there is nothing wrong without even coming out. Their soultion was to turn my ac cooler to take the humidity out.. I have it set at 71 with 74% Inside Humidity..
This will most likely be a battle.
I'll let you know what the original hvac installer says when they meet with me. They are already being rude and saying the parts are correct and there is nothing wrong without even coming out. Their soultion was to turn my ac cooler to take the humidity out.. I have it set at 71 with 74% Inside Humidity..
This will most likely be a battle.
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