Your Furnace Breaks Right After Move-In — Now What?

It is a call we get every fall. A buyer closed in August, the weather turned in late September, they flipped the thermostat to heat for the first time, and nothing happened. Now there is an HVAC tech in the basement quoting somewhere between $600 and $9,000 depending on whether this is a control board or a cracked heat exchanger, and the buyer is asking a completely reasonable question: I just bought this house. Isn't someone responsible for this?

The honest answer is usually no, not the seller. But that is not the end of the story, and there is a lot you can do — both before closing and in the moment — to keep a surprise like this from becoming a financial emergency.

Why the Seller Is Almost Never on the Hook

In Colorado, homes are sold as-is unless the contract says otherwise. The Colorado Real Estate Commission's Contract to Buy and Sell gives you an inspection period to investigate the property and either negotiate or walk. Once you close, the condition of the property is your problem. That is the entire economic function of the inspection objection deadline — it is your one clean shot at making the seller pay for something.

There are narrow exceptions. If the seller knew about a material defect and actively concealed or misrepresented it, that is a different conversation, and it is a legal one. A seller who wrote 'no known issues' on the Seller's Property Disclosure while sitting on a written HVAC report recommending replacement has a real problem. But 'the furnace was 22 years old and it finally died' is not concealment. It is age. Colorado law does not require a seller to warrant that equipment will keep working; it requires them to disclose what they actually know.

Practically speaking, pursuing a seller after closing means hiring an attorney, proving knowledge, and spending real money to chase a repair bill that is often smaller than the legal fees. It happens, but it is rare, and it should not be your plan.

What a Home Warranty Actually Covers

A home warranty — sometimes called a home service contract — is a service agreement, not insurance. You pay an annual premium, typically $500 to $900 in the Denver metro, plus a service call fee of $75 to $150 every time you use it. In exchange, the company agrees to repair or replace covered systems and appliances when they fail from normal use.

Here is what people get wrong about them. A home warranty covers mechanical failure, not condition. If your 20-year-old furnace stops working, that is generally covered. If your furnace works but was installed badly, is undersized for the house, or has a pre-existing defect the company can point to, that is generally not. Most contracts also exclude code upgrades, permits, disposal of the old unit, and modifications to ductwork or venting — which is exactly where the money goes on a furnace replacement in an older Denver home. We have seen a covered replacement where the warranty paid for the unit and the buyer still wrote a check for $2,400 in venting and permit work to bring it up to current code.

Coverage caps matter too. Many contracts cap HVAC at $1,500 to $3,000 per occurrence. If you are replacing a furnace and coil in a Wash Park bungalow with tight mechanical space, you can blow through that cap quickly.

So is a home warranty worth it? Our take: for a first-time buyer with a thin post-closing cash cushion and a home with aging systems, yes — not because the math is favorable over ten years, but because it converts an unpredictable $7,000 risk in year one into a predictable $700. For a buyer with reserves and a newer home, the money is usually better kept in the bank. And critically, a home warranty is one of the easiest things to get a seller to pay for. Asking the seller to cover a one-year warranty costs them a few hundred dollars and does not touch the sale price, which makes it a far easier yes than a $5,000 credit.

The Move Is to Handle This Before You Close

Everything above is triage. The real leverage is in the two weeks between going under contract and your inspection objection deadline.

Get the age of every major system in writing. Your inspector will pull the data plate on the furnace, water heater, and AC condenser and give you a manufacture date. In the Denver metro, a gas furnace typically runs 15 to 20 years, a water heater 8 to 12, and an AC condenser 12 to 15. If the inspection report says the furnace was built in 2004, you are not buying a working furnace. You are buying a furnace that happens to still be running.

Ask for an HVAC-specific evaluation when the general inspection raises a flag. A general home inspector is not going to disassemble a furnace or scope a heat exchanger. If the report notes rust at the base, a delayed ignition, soot, or a cracked flue, spend the $150 to $250 on a licensed HVAC contractor to look at it during your inspection window. That report is also your negotiating document — a seller can argue with an inspector's hedged language, but a contractor's written recommendation to replace is much harder to wave off.

Test heat in the summer and AC in the winter. This sounds obvious and almost nobody does it. If you are buying in August, ask your inspector to run the furnace anyway. Yes, it is 92 degrees. Run it for ten minutes. This is precisely how the September surprise gets caught in July.

Then negotiate with the right instrument. You have four real options at the inspection objection, and they are not equal. A price reduction lowers your loan amount and your monthly payment but gives you no cash at closing to actually do the work. A seller credit toward closing costs gives you cash flexibility but is capped by your loan program — conventional loans typically allow 3 percent of the purchase price with less than 10 percent down, more above that. Having the seller do the repair before closing means it gets done, but you have no control over who does it or how well. And a seller-paid home warranty covers the tail risk cheaply.

In our experience, on an aging-but-currently-working system, the credit plus a warranty is usually the strongest combination. On a system that is actively failing, push for replacement or a credit large enough to actually replace it — and get a bid, not a guess.

What About Homeowners Insurance?

Your homeowners policy is not a maintenance contract. It covers sudden and accidental damage from a covered peril — fire, hail, a burst pipe, wind. A furnace that dies of old age is specifically the kind of thing insurance excludes. Filing a claim for it will not get you paid and may still show up on your claims history, which matters more in Colorado than in most states given how carriers are pricing hail exposure along the Front Range right now.

Where insurance does apply: if the furnace failure caused a covered loss. Heat goes out in January, pipes freeze and burst, and now you have water damage — the water damage is likely covered, the furnace itself is not. Same logic with a water heater. The tank is yours; the flooded basement may be the carrier's.

Budget Like This Will Happen, Because It Will

The single best thing a buyer can do is stop treating the down payment and closing costs as the finish line. Plan to have three to six months of expenses plus a dedicated home reserve of one to three percent of the purchase price available after you close. On a $600,000 Denver home, that is $6,000 to $18,000 sitting in a boring savings account doing nothing — until the day the heat exchanger cracks, and then it is the difference between an inconvenience and a crisis.

For planning purposes, current Denver metro ballpark ranges: a furnace repair runs $300 to $1,200; a furnace replacement $5,000 to $9,000 installed; a water heater replacement $1,800 to $3,500; an AC condenser replacement $6,000 to $10,000; a full HVAC system $14,000 to $20,000. Xcel Energy and the federal energy efficiency credits can meaningfully offset a heat pump or high-efficiency furnace, so if you are replacing anyway, price the efficient option before defaulting to the cheapest like-for-like swap.

The Bottom Line

The furnace dying three weeks after closing is not a sign you got taken. It is a normal, statistically predictable event in the life of a house that nobody warned you to plan for. The buyers who handle it well are the ones who knew the equipment was old before they closed, negotiated for a warranty or a credit while they still had leverage, and kept a reserve after closing instead of spending it on furniture. That is the whole playbook. At Emblem, we would rather have an uncomfortable conversation about a 21-year-old furnace during your inspection window than a much more expensive one in October.