Jesus, I understand you are trying to let people know about this home builder but honestly the only looking bad from all these posts is you...............................

We understand that NVR Dan Ryan Homes, probably not the best builder. These posts serve very little purpose.

As far as sizing: Our 3600 sq ft house in Indiana served fine by 3.5T AC with 4T coil 110K BTU furnace, my neighbour chose to upgrade his house 3200 sq ft to 3.5T and the system is not working properly. Cools down pretty fast without removing moisture. My planned 4,000 sq ft engineered ( by us ) has total demand load 2.5T (2800BTUH), but because of Manual S and the heating load 68k matching equipment from AHRI directory may have to go 3.5 or even 4T.

furnace will need to deliver 72k heat, but to deliver this BTUH it has to have higher CFM rating on the blower. while you can have a different CFMs on cooling and heating... The ductwork design does not work well when cooling CFMs are 980s and heating CFMs 1490s.

So Manual S calls for higher rated AC or ASH unit. Without knowing locations and the load, I think calling NVR Dan Ryan Homes HVAC Sizing SCAM is a little harsh.

The ZoneX system does not compensate for load, it probably balances upper and lower floors temperature. Without it there would a significant temperature difference between floors.

NVRs issue in my opinion is not with sizing, rather not so good exterior details that leak air.

Millworkmeen thank you for your opinion and the motivation to continue to provide many with facts and truth.

BT 3.5T is not enough for 3200sqft unless you built a passive house, is that the case here? The zonex will never balance because of the time it takes to heat/cool the zone active vs the zone in queue. Zoning is for gently heating and cooling areas to equalize comfort in small variances not how Dan Ryan is using it so yes it is absolutely just to save a buck on putting in a properly sized system so my term is not too harsh.

A 3 ton AC system for new construction could be the proper size. It comes down to insulation values, number of windows, orientation of the house, and location. The zoning problems can exist regardless of size. Most contractors do a poor job when it comes to zoning.

You should ask if heating and cooling calculations were done for your house. If they were then ask for a copy. You are likely to get excuses why a copy is not available. Maybe a copy is on file with the local compliance office

Given what you have posted about the problems with your furnace, you mostly likely have an installation problem than a sizing issue.

Just report him as abusive or spam as is appropriate. He's (or she's) simply trolling.

I searched on NVR and found at least nine threads started by her/him and all of them are simply moronic and actually seek no needed assistance to resolve anything. A considerable amount of her supporting info is simply incorrect!

Dear HU-327261041, Many years ago (like 20 ) HVAC systems were sized by sq ft. And the correct suction line temperature were set by beer cold. Since that time the industry moved on...

The ACCA https://www.acca.org/standards/technical-manuals Established the System Design Process to better engineer HVAC systems. You can see manual J, manual S, Manual D, etc - to determine your system and design your duct-work.

NVR hires out these designs. I am sure they do this at the lower end [when choice of 3.5T vs 3T is presented they use 3T], still it is engineered.

BT 3.5T is not enough for 3200sqft unless you built a passive house, is that the case here?

LOL, There are houses in between of NVR mass production and a passive house design.... Here is ManJ report. 1T = 12,000BTU. You can see that Sensible can be satisfied ~2T system, total sq ft near 5,888 sq ft.

Rainbow, Butterfly, Kitten,Unicorn,

Your name made me laugh. I guess you ran out of space for puppies and bunnies, and lady bugs.