I built my house in 2020. The ac guys came out and said were getting a 3 ton. Our house is 2300 sq ft, 1805 living. I told him that we should have at least a 3.5 ton and he laughed at me. I even offered to pay for the upgrade through our builder. Still, nothing. Had this big ordeal about it and had the 'experts' come out for a second opinion. Same conclusion. Four long, hot years later. We tossed the 3 ton and got a four. Best decision I ever made. I live in southern Louisiana by the way.

System sizing is multi factor. Not just climate zone but, also the number of occupants, windows, ceiling height, number of occupants, IT equipment especially high end custom gaming PCs, appliances, and the insulation. Whenever you are building a house from scratch, it is worth it to hire an MEP engineer. Also having dampers on the branch take offs can ensure proper air distribution so all rooms are heated and cooled evenly.

Impossible conversation. Each house in each region will be so different. Windows, insulation, leaks etc. People really need to spend the extra money to have it surveyed first.

The HVAC industry is such a rip-off. I was sold a 4-ton unit, but the shipping crate said it weighed only 335 pounds.

An HVAC guy telling people they cant do it themself, ill just put on my surprised face.

Manual D for proper duct sizing

Every new house we do. I run a load calc. My problem is my state of nj has to be ran at 89 degrees. Even though we get days at 95. We in nj every company has to do there own load calcs. Even in replacement work.

blah blah blah. is all I heard after the 1st few seconds

I have a slightly larger system, and it works great. I would be more afraid of going too small... and having the thing run all day long just to pull the house down a few degrees. Mine will pull down to whatever I want it to, quickly. It gets up to 115f in the summer here. Dry heat. House is not real tight and thermally efficient. So... the larger unit works great. Specs would call for a 3 ton. I have a 4 ton. 1700 sq ft.

Please make video on step by step how to do heat load calculation.

Sooo how do you find out what the proper tonnage for a residential? Like, measuring the square footage to find the BTU’s, CFM, Airflow (I.e. latent heat). Manual J

My house is in N. Texas. It's

Great video. Do you have anything for apartment buildings?

I hired an engineer to perform an HVAC load analysis. Says I need a 24K btuh system. Are all 24K systems pretty similar? I usually install Diakin or Fujitsu units myself then hire a pro to check and charge it.

I am curious for a 2-story house if the downstairs should have a much larger furnace and the upstairs a much larger A/C ? For my house the downstairs has the larger A/C and the upstairs struggles to remain cool.

We have a 2000sf mobile home with a 4 ton heat pump. It needs replaced I was thinking of a 5 ton but one with a 2 speed condensing unit. Were in texas and no shade 14 windows plus a sliding glass patio door.

Have you ever heard of cool calc manual J and if so what are your thoughts on it?

Fortunately here in the St Louis metropolitan area, St Louis County provide a worksheet ( one of the best I've ever worked with). From a normal size house plans, say 2500 square feet it takes about a half an hour or so to complete.The big Builders still get around it a little bit by using the same worksheet for each house model they may have, even though the house may face a different direction ( it's close but we still find some under size systems ). We are also required to put a cold air returns in every room but the bathrooms or kitchens . The St Louis County worksheet is so good, all the surrounding counties and the City of St Louis honor it. I just wish code enforcement would require two systems for all two story houses but they still let the builders get by with one large unit.

Is there a map for Canada I may be able to see?

Hi Josh - do you service Miami, Florida?