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Hello,
This is the third new home repair I have been called out for in the last two weeks. Same builder and Sub on all three. New homes all 1250-1350 sq ft. All have 2 ton ac units. After the...

Yes she is,
The builder built about 15 homes in that neighborhood, all about the same size and their was not a meeting to discuss the AC.
Very southern IL

I have a customer in a newer home(18 months), that can not get her inside temp during cooling below 78 degrees in the afternoon. She has a 2 ton unit and the builder thinks that is good enough and...

The return is larger. I think the filter was 21x10.

Hello,
You won't believe this one. A 1850 sq ft house on a slab. House is 14 months old and customer cannot get summer temp in house under 79 degrees inside. Unit has been looked at several times...

Sorry about the confusion. The trunk at .3 and the branches at .1. This system has little air flow.

Is it possible for a duct system to have a .3 static pressure for the trunk and .1 for the runs, and work properly?

what about 22,000 difference

This doesn't make sense. If I size a heat pump on a new construction with internal shade and the home owner does not use shades or blinds, that its undersized for AC even more when heat is needed....

I was reading about the ACCA 8th edition heat gain calculation and they recommend including internal shade for window gain unless the glass is installed for day-lighting. Can anyone tell me what...

Steve,
I'm still learning this stuff. What whould you or any other person reading this do? I'm thinking If I size an AC with blinds or other internal shade and the customer does not use any window...

Is there a code for that or is a rule of thumb?

Hi,
How should I do my windows on a Manual J? As no shade, blinds or internal shade? Or do I do them all with some type of shade built in or all bare?

I called Goodman an the tech rep said it should be that model should be installed with a static pressure of .2-.5. The tech data with the unit said tested up to .2.
Looks like a .1 was not an...

From the information I have, they duct was designed at a .3 external static pressure. I'm wondering why it was designed at a .3 instead of .1. Is this how Goodman recommends installation or was...

I'm troubleshooting a goodman heatpump and was wondering if the static pressure of .3 which it was designed for was ok? Trunk lines seem sized right to a .3. Is this a goodman thing(not much...