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Cinco Ranch is older than most of west Fort Bend County by a full building generation, and that changes the whole conversation. Most of the equipment here is on its second or third cycle rather than approaching its first, and the ductwork underneath it is older than either.
Fort Bend County’s median house was finished in 2005, and 36.5% of the county’s housing went up between 2010 and 2019. Cinco Ranch does not fit that profile. The land was assembled in 1984, the community opened in 1991, and its earliest sections are now more than thirty years old.
That puts most of this housing on a second or third air conditioning system, not a first — a genuinely different situation from Aliana or Fulshear twenty minutes away, where the original builder equipment is only now reaching the end of its first life.
Three consequences follow. The ductwork is the oldest component in the house and has been there through every equipment change; nothing about installing a third condenser refreshes a thirty-year-old duct run. The refrigerant history is mixed: a system replaced in 2005 is R-22, one replaced in 2014 is R-410A, and they call for different decisions when something fails. And the condensate protection is whatever the last installer left, which on a house with three equipment changes behind it is a genuine unknown until somebody looks.
Cinco Ranch is unincorporated, in the City of Houston’s extraterritorial jurisdiction, and not in the City of Katy or Katy’s ETJ — it sits roughly ten miles from that city and simply carries its mailing addresses. Practically, that means no city mechanical code applies to it.
Nor does the county fill the gap. Fort Bend County has not adopted building codes for single-family residential development, and its list of permit triggers for unincorporated areas — floodplain work, an enclosed structure or slab of 400 sq ft or more, land development, large fill or excavation, driveways, turn lanes, right-of-way utility work — contains no mechanical item at all. And a city cannot reach into its ETJ to close it: Town of Lakewood Village v. Bizios (Tex. 2016) and Collin County v. City of McKinney (Tex. App.—Dallas 2018) between them establish that every municipality needs legislative authorization to enforce building codes beyond its corporate limits, and none has it.
So on a house here with three equipment changes behind it, none of those three installations was inspected by anyone. That is not an accusation about any of them; plenty of unpermitted work is excellent work. It does mean that whether the equipment was ever correctly sized for the house is a question with no external answer, which is a reason to ask for the load calculation on the next one. See sizing and load calculations.
One caveat worth knowing: a portion of the Cinco Ranch area was annexed into the City of Houston proper around 2010, so a small share of parcels may sit inside Houston city limits rather than merely in its ETJ. That is an address-level question, not a community-level one.
A first replacement is bought by somebody with no experience of the decision. A third is bought by somebody who has done it before — and who therefore has the standing to ask for things a first-time buyer does not know exist.
Three of them are worth asking for here specifically. A total external static pressure reading across the air handler, which after thirty years of duct life is the single most informative number available and takes minutes to take. A fresh load calculation rather than a match to whatever is currently installed — because if the last two systems were sized from the one before them, the original error has been carried forward twice. And a written account of what happens to the condensate arrangement: pan, secondary line and float switch, on equipment that sits in an attic above finished rooms.
With a median household income of $161,972 and 74.2% owner-occupancy, this is also a market where the higher equipment tier can genuinely earn its money — two-stage or variable-capacity cooling with a variable-speed blower runs longer and slower, which is exactly what a Gulf Coast latent load wants. But it only earns it if the duct system can carry the air, which brings the whole thing back to the static pressure reading. See indoor air quality and humidity.
On a house of this vintage, read duct repair and sealing before AC replacement and installation — the duct system is older than anything else in the house and usually decides what new equipment can achieve. Refrigerant and system age matters if the current system predates about 2010.
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