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Fifteen pages, grouped the way the decision actually gets made out here: what is it doing right now, was it ever the right size for the house, is it worth fixing, what happens in October, and who — if anyone — ever checks the work.
Manual J, why oversizing is the default error on builder installs, and why outside a city nothing external ever checks that it was done. The most useful page on this site.
30.3% of the county went up between 2010 and 2019 with base-tier equipment installed to a price. It is 7 to 16 years old now and out of every warranty that mattered.
Which cities require a mechanical permit and which require contractor registration — and why unincorporated county, and every city ETJ, has neither.
Climate Zone 2A, 89 days a year at or above 90°F, and 4,099 cooling degree days in 2025. What fails first on a system running that schedule.
What counts as an emergency, what after-hours pricing looks like, and an honest word about response time on the far side of an 885-square-mile county.
The county’s two replacement waves, what a changeout actually costs, and the seven things that belong in the quote.
Every system here provides heat through the same air handler, and it sits unused for seven months before being asked for full output on one night.
961 heating degree days against 4,099 cooling. Ignition, flame sensors, rodent nests in the burner compartment, and the cracked heat exchanger nobody can see.
One attic cabinet does both seasons, which is why a November no-heat call on an older system is rarely a furnace-only decision.
One machine, both seasons, no combustion and no heat exchanger — and an honest account of what is and is not known about uptake in Texas new build.
Three things that decide how a Fort Bend County system performs and are almost never in the comparison between two quotes.
ENERGY STAR puts typical duct losses at 20 to 30%. Long runs across wide west-county floor plans, and why the return side is the real problem.
One thermostat downstairs deciding for a floor it cannot feel. What zoning does, what it costs and what it cannot fix.
A mean August dew point of 73.5°F, and why a house at 74°F can still feel wrong. Where this connects straight back to sizing.
R-22, R-410A and A2L — including EPA’s 26 May 2026 reversal, effective 27 July 2026, and the challenge filed against it in late July.
The April cooling check and the October heating check almost nobody in Houston books. One of the two has a carbon monoxide angle.
Metal shops on acreage, detached garages, converted outbuildings and additions the ductwork never reached — and where a mini-split is the wrong answer.
Own or manage a building rather than a house? Light commercial is rooftop package units rather than split systems, a property manager on a service agreement rather than a homeowner in July, and downtime that costs a tenant money — see commercial AC and HVAC across Fort Bend County.
Describe what the system is doing, or just say what year the house went up and roughly how old the equipment is. Either is enough to start.
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