Manual J is a form that indicates the heat loss/gain load. Manual D is for duct design, Manual S is for equipment and Manual T for those eight beautiful inlaid walnut bordered teak wooden registers custom made with decorative wildlife scroll art. Look, you can't really be effective until the load is justified properly. The form will give you specific heat multipliers for various types of construction envelopes considering infiltration and ex filtration to compensate by means of sensible loads as well as latent. I'm sure you could look up equations on thermal conductivity values of K or transfer rates of U; however, this is why the forms above are used as a healthy start for comforting your customer..
I am a service and repair based company and looking to do a small new install duct/unit etc... The house is 1k sqft and we are putting a 2.5 ton on the house but i need help with the load calcs and the duct sizing... any help would be greatly appreciated... Thanks!!
Sounds like your customer is getting a great deal!
"The only true wisdom is in knowing you know nothing" Socrates