Hello everyone. I am a long time lurker and decided I would join the site. I am interested in learning as much as I can about the proper methods of HVAC equipment installation and maintenance.
I am builded a pawn shop in my area in NW Louisiana. I have gotten 3 quotes for installation of a HVAC unit that I already own. I am not satisfied with the quotes that I am receiving in terms of price, nor installation materials and methods. For example, I do not want to run supplies with flex, and the installers that have been out everyone runs flex on the majority of jobs.
I went also to a sheet metal shop and they wanted a tons of money to provide and install a supply plenum, return plenum, and 5 supplies in the showroom. They didn't even quote on putting supplies and returns in the offices and bathrooms.
I have a Rheem 5 ton heat pump with 10kW of electric heat. I do not have natural gas at my location, only electricity. The unit may not be ideal, but I already own it and I do not have the budget to purchase anything else this summer. If I can install this unit and make it through the summer then I may have the funds to add to or upgrade next year.
I have some drawings of the building.
Questions: how would you position the unit?
I am thinking of hanging it with all-thread and uni-strut.
How would you run supply lines?
I am thinking 8" + 10" + 10" + 10" + 10" + 8" sidewall supplies on the main wall of the showroom.
I am thinking 16" return at the peak on the wall in the showroom.
I am thinking 8" supply and 10" return in office #1.
I am thinking 8" supply and 10" return in office #2
I am thinking 5" and 6" supplies in the bathrooms.
I am thinking 10" return in the hallway.
This would all be rigid fittings, connectors and KD pipe, and all fittings and joints covered with duct mastic (pookie, duct butter) and insulated.
Not sure on what kind of insulation. I understand it needs to be insulation design to insulate ductwork but I am not sure what brand or R-value. Assuming I should go with R-8.
Notes: Windows face South and are shaded by the 5 foot overhang.
Note: the windows face South and in the summer they are mostly shaded by the 5 foot overhang. They are Low-e double pane and have solar tinting on both surfaces. They are in aluminum frames.
Shots up in the attic where I would like to place the HVAC equipment.
Another view. If I place the HVAC unit perpendicular to the showroom wall (as shown) I would have up to 80" to divide between the supply and return plenums.
This is the wall were I would like to place the 8", 10", 10", 10", 10", 8" supplies and 16" return.
I appreciate anyone who offers helpful suggestions and constructive criticism.
Thank you for your time.