My wife and I are having a new home built in a subdivision. We've upgraded everything (flooring, lighting, cabinets, etc.,) to avoid moving into a new home full of "builder grade" stuff. Unfortunately, upgrading the HVAC system was not an available option. As a result, I'm stuck with lower end equipment. While I'd prefer to upgrade to better quality equipment (stuck with Lennox 13ACX AC and Lennox ML180UH gas furnace), I understand their desire to keep costs low and I don't think i'm getting total junk.
My issue is with the fact that all the homes I've looked at have the same sized unit! These homes range from 2 story ~1,950 sq ft. homes on slabs to ~3,400 sq foot homes on finished walk out basements. All the homes I saw so far have 13ACX-030-230-12 AC units outside. Some quick math tells me the builder has decided that 2.5 tons of cooling works equally well for homes of all sizes.
Before I address this with them (not in a "can I upgrade" way, but more in a "I won't go to closing with a poorly designed HVAC system in place" kind of way) I'd like some opinions. Unfortunately, I can't call in outside companies, as the contract stipulates that no outside vendors/contractors are allowed on site prior to closing. As a result, I'll provide as much info as I can here, and humbly ask for your assistance in providing well articulated evidence that the HVAC system is improperly sized (or, evidence that I don't know what I'm talking about and that I have nothing to worry about).
Info on my house:
Located in the Northern area of Virginia (physically located near the northern tip of the state)
Front of the home is North facing, rest of the home has excellent shade either by large trees or a combination of elevation changes and neighboring homes.
3 level (2 stories sitting on a walk out basement)
~3,150 total (1,100 first floor, 1500 2nd floor, 650 in the basement. It should be noted that nearly all finished space in the basement is in the "daylight" portion, meaning not actually below grade)
R-13 in the walls, R-38 in the attic, vinyl siding
Low-E windows (~17 of them, 7 south facing, 8 north facing, 1 east, 1 west), 1 glass door south facing, 1 sliding door also south facing.
Based on that info, I feel the system they intend to install is undersized.. Am I nuts? Thanks for reading my novel, and thanks for any info/links you might be able to provide!