New a/c for shop.... not impressed

[webdog]

Even with the insulation, in your area, you are undersized. That shop should have had 4 tons. You can contact your local HVAC city or state inspector and they will come out and check it out.

I don't know if you're in a humid climate it's better to have a smaller unit as it will remove more humidity.

I was planning a 5 ton unit in my 2600 sqft addition and the HVAC guy did a load calc and said 3-3.5 is better, our old building that is the same footage of this guys has a 2.5 ton and it right now is cooling both buildings since they are connected and the new HVAC system is not installed yet. So it is cooling with 1600 sqft per ton right now. Sounds like something else is going on... Have you checked the temperature coming out of the vents?

You ideally want the unit to run non stop on the hottest and most humid day of the year.

 

[WhiffySpark]

Who keeps their house at 77?

I prefer 68

 

[TWD puller]

duct work does look a bit small. I used a 5 ton unit for a 60x40x16 inside dimension, stick build, insulated and dry walled. It just plugs into a airsock running at the ceiling the 60' length. Keeps it nice and chilly in the summer and warm in the winter. I got mine from ************************ I think and cost less than 100 bucks for the whole thing.

Can you send pics of your system. I am building a 60x100x16 and was thinking about the same as yours.

 

[thymer]

Can you send pics of your system. I am building a 60x100x16 and was thinking about the same as yours.

Here you go. 5 ton system in a 2x6x14 stick built and insulated. It’s about perfectly sized for the space. One drop down to the office area.

 

[TWD puller]

Here you go. 5 ton system in a 2x6x14 stick built and insulated. It’s about perfectly sized for the space. One drop down to the office area.

Do you get air movement across the shop?
I was going to do the same thing but run it down the middle and also have a big *** fan to help mix and move air

 

[thymer]

Do you get air movement across the shop?
I was going to do the same thing but run it down the middle and also have a big *** fan to help mix and move air

Yes even across the whole shop. The holes in the sock are created for the specific area to be cooled. In my case I didn’t want to lose the ceiling height in the middle of the shop so chose one side. The holes are in the bottom and side of the sock at angles to evenly spread the air.

 

[Terry D]

Hey guys. Just got a new a/c unit in my shop and it doesn’t seem to get the job done. I have a 36x40 garage with spray foam insulation in the ceiling and fiberglass in the walls. I have good windows, insulated doors, and had skylights but I covered them up recently.

I wanted a big mini split but was talked out of it by my hvac guy (several of them actually). I still think that would have been my best bet.

My situation: I turn the unit down to 75 the night before so it will be cool in the morning. I go in the next morning and it’s 75. I will bump it down to say 72 and it will never get below 75. It will run all day nonstop and as the day gets hotter, the temp will slowly go up in the shop. I’ve only ran the unit a time or two but have honestly never heard it shut off on its own.

I’m worried I was sold an undersized unit although I know nothing about it. Any info would be awesome

Seems like I remember the box saying it was a 36k btu unit


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The ductwork just doesn't look right. I would suggest to get your installer to come and measure the cfm or static pressure across your coil. Without proper air flow, the unit will never cool or remove humidity they way it was designed for. Also without proper air flow across the coil, you cant determine if the unit is even charged correctly.

Sent from my SM-G960U using The Garage Journal mobile app

 

[Farmall450]

The ductwork just doesn't look right. I would suggest to get your installer to come and measure the cfm or static pressure across your coil. Without proper air flow, the unit will never cool or remove humidity they way it was designed for. Also without proper air flow across the coil, you cant determine if the unit is even charged correctly.

Sent from my SM-G960U using The Garage Journal mobile app

Thread is 2 years old...doesn't look like the OP ever came back and updated if it was fixed or not.

 

[nadogail]

What is the current status of your Garage Air Conditioning?

We are waiting for an update.

 

[My Old Tools]

Generally speaking GA is more humid than TX. If you plopped your house down in GA you would need a bigger system.

Another person that doesn't realize that Texas is huge and ranges from desert to mountains to gulf coast to hardwood and pine forest to swamps. East Texas sits right beside Lousiana. You can't get much more humid until you through in the gulf coast, also right beside Lousiana.