If you smell gas, leave the house and call 911 and your gas utility before anything else.
Farmington is really two housing markets sharing one city, and furnaces are where the difference is most obvious. The historic core has houses that predate central heating as we know it, which have been through conversions and retrofits nobody documented. The subdivisions that filled in from the 1990s onward have purpose-built systems, many of them high-efficiency, now reaching the age where the first real failures appear. A contractor who approaches both the same way will get one of them wrong, so the useful first question in Farmington is which of the two houses you are in.
A house that has been standing for a century has had its heating system replaced several times, and each replacement worked around whatever was there. The result is duct layouts that make sense only historically: runs through closets, registers in odd places, a furnace in a basement corner reached by pipes that were sized for a different appliance entirely. None of that is necessarily wrong, but it means a diagnosis has to start by finding out what is actually installed rather than assuming.
The specific things worth establishing in an older home are the state of the chimney, whether the flue has been lined, whether any of the original duct insulation remains and what it is, and whether the current furnace is vented the way its manufacturer requires. Retrofits done decades ago to equipment that has since been replaced twice are where the surprises live.
Where asbestos-containing material may be present around old duct work or on an old boiler, that is a stop-and-assess moment, not something to pull apart to get a look at the furnace. It needs identifying and handling by someone qualified to do it.
A condensing furnace is a more complicated appliance than the one it replaced, and the parts that fail first are usually the ones that handle water rather than fire. Condensate drains clog. Condensate pumps fail. Secondary heat exchangers corrode. Inducer assemblies wear. None of these are exotic, but they are specific, and they are why a twenty-year-old high-efficiency furnace behaves differently from a twenty-year-old mid-efficiency one.
The common symptom is a furnace that locks out and needs resetting, often intermittently and often in the coldest weather, when the unit is running the most and producing the most condensate. A blocked drain will do exactly that. It is a cheap fix and a frequently missed one.
The other newer-home issue is zoning. Two-story homes here are often zoned, and a zoning board, a damper motor or a failed zone thermostat presents as a heating fault when the furnace itself is working correctly. Whether the house is zoned is worth saying when you call, because it changes where a technician looks first.
Houses on the bench above Farmington have more exposure than houses on the valley floor — more wind, more sun on one side, bigger day-to-night swings. In a two-story house that often turns into a specific complaint: the upstairs is cold in the morning and too warm in the afternoon while the main floor is comfortable, and no thermostat setting fixes both.
That is a distribution and control problem rather than a capacity one. The usual contributors are long duct runs to the far end of the upper floor, return air that is all on the main floor, and a single thermostat trying to manage two floors with different loads. Balancing dampers, adding return capacity upstairs, or zoning are the real options, and they cost less than the bigger furnace people often ask for first.
If a contractor’s only proposal for uneven heat is more capacity, ask what the airflow measurements were. A furnace that cannot get air to a room will not get more air to it by burning more gas.
In a condensing furnace the usual suspect is condensate. A blocked drain line or a failed condensate pump will shut the unit down on a safety switch, and it happens most in the coldest weather because that is when the furnace runs longest and makes the most water. It is an inexpensive thing to check and it gets overlooked. Pressure switch and inducer faults present similarly, so the drain is where a technician should start.
Rarely. That pattern is about distribution and control rather than capacity, especially in a bench home with sun and wind on different sides. Long supply runs to the upper floor, return air located only on the main floor, and one thermostat managing two different loads will all produce it. Balancing, added return capacity upstairs, or zoning address it; a bigger furnace generally does not.
What is actually installed, before anything else. Older Farmington homes have been through several heating systems and each one worked around the last, so the chimney condition, whether the flue is lined, how the current furnace is vented, and what the old duct insulation is made of all matter. If material that might contain asbestos turns up around old ducting, that needs identifying by someone qualified rather than pulling it apart.
Describe what the furnace is doing and we'll match you with a licensed contractor who can act on it.
Get a Furnace Contractor OutA short description is enough — we'll follow up to confirm the details and get someone scheduled.
