Heating Repair
No heat, short cycling or odd noises from your furnace or heat pump? MoJo handles heating repair across the Denver metro, Monday to Saturday.
A furnace that won't light, a heat pump blowing cool air, radiators that stay cold on a January morning: all of it falls under heating repair, and none of it picks a convenient moment. MoJo Home Services is a family-owned HVAC company working across the Denver metro, with technicians based in Aurora and Wheat Ridge. We find out why the system stopped doing its job, explain it in plain terms and fix it so it stays fixed.
Signs Your Heat Needs a Technician
Some problems announce themselves. Others creep in over a few weeks until a cold snap exposes them. Call us if you notice any of these:
No heat, or cool air from the vents. Common causes include a failed igniter, a dirty flame sensor, a tripped limit switch or a thermostat that has lost power.
Short cycling. The system starts, runs a few minutes and shuts off. A clogged filter, an overheating heat exchanger or a faulty pressure switch is often behind it.
New noises. Squealing usually points to the blower motor, a boom at startup to delayed ignition, and rattling to a loose panel or a failing inducer fan.
Cold rooms. One end of the house stays chilly while the other overheats, which can mean blocked returns, leaky ducts or a weak blower.
A yellow, lazy flame or soot near the burners. That signals poor combustion and should be looked at before anything else.
Bills climbing with no change in how you set the thermostat.
What Happens During a Repair Visit
Your technician starts at the thermostat and works through the whole system instead of guessing at the first part that looks worn. On a gas furnace that means the filter, igniter, flame sensor, gas pressure, pressure and limit switches, the blower and the control board's fault codes, plus a look at the heat exchanger and the venting. On a heat pump it means the outdoor coil, the defrost controls, the refrigerant circuit and the backup heat strips. Before any work starts, you hear what failed, why it failed and what the fix involves, so the decision stays yours.
Most repairs are finished in a single trip because our trucks carry common parts like igniters, flame sensors, capacitors and pressure switches. When a part has to be ordered, we tell you how long it should take and what can be done to keep the house warm in the meantime.
When a Heating Problem Can't Wait
Some situations call for emergency heating repair rather than an appointment next week: no heat while it is below freezing outside, a home with an infant or an older relative, a furnace that keeps shutting itself down on a safety switch, or a burning smell from the equipment. Our phones are answered Monday through Saturday from 8am to 8pm, and we are closed on Sunday. Same-day or next-day appointments are often available, so call (720) 807-4050 as early in the day as you can. Calls are dispatched from our Wheat Ridge location, and our technicians cover the whole metro, including Aurora.
Two situations are not repair calls at all. If you smell gas, leave the house without flipping any switches and call your gas utility or emergency services from outside. If a carbon monoxide alarm sounds, get everyone into fresh air and call emergency services before you call us. Working carbon monoxide detection on every sleeping level is the simplest protection a gas-heated home can have.
While you wait for a technician, a few checks are safe for anyone: confirm the thermostat is set to heat and has fresh batteries, look for a tripped breaker or a furnace switch that was turned off, make sure the furnace door is fully closed (a safety switch keeps the burner off when it is not), and replace a filter that looks gray and matted. If the system still will not run, leave it off and let us take it from there.
Furnaces, Heat Pumps and Boilers
We work on every common heating setup in metro homes: gas furnaces, heat pumps and dual-fuel systems, ductless units, and hot-water boiler systems that feed radiators, baseboard or radiant floors. Our technicians service all makes and models.
Altitude matters here. At roughly a mile above sea level the air carries less oxygen, so gas appliances are derated and their combustion has to be set up for elevation. A furnace that was never adjusted for Denver can run rich, soot up its burners and wear out its heat exchanger early. Dry winter air and quick swings from mild afternoons to subzero nights add their own strain, which is why the same handful of parts fail so often in Colorado.
When Fixing Stops Making Sense
Most heating problems are worth fixing. Replacement starts to make sense when a furnace is well into its second decade and needs a major part, when the heat exchanger is cracked, when repairs are coming every season, or when the equipment can no longer keep the house comfortable on the coldest days. Your technician will tell you honestly which side of that line you are on. If it is time, our page on replacing your heating system explains the options and how we size the new equipment.
When replacement does make sense, our 2026 furnace replacement cost guide shows typical prices by home size, and the free HVAC price calculator gives you a range for your home.
Why Neighbors Trust Us
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Same-day service on most calls
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We stand behind every repair & install
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Serving your neighborhood since 2009
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Help Center
Frequently Asked Questions: Heating Repair in Denver, CO
My heat stopped working. What should I check before calling?
Make sure the thermostat is set to heat and its batteries are fresh, check the breaker and the furnace's on/off switch, confirm the furnace door is seated, and look at the filter. If all of that checks out, leave the system off and call us. Resetting it over and over can hide the real fault or lock out the control board.
Why does my furnace keep turning on and off?
That is short cycling. The usual causes are a clogged filter that lets the furnace overheat and trip its limit switch, a dirty flame sensor that drops the burners a few seconds after they light, a thermostat mounted near a supply register, or equipment that is oversized for the house. Each one wears parts faster, so it is worth having it diagnosed.
Is it normal for a heat pump to blow cool air in winter?
For a few minutes at a time, yes. A heat pump runs a defrost cycle to clear frost from the outdoor coil, and you may see steam rising from the unit while it does. If cool air lasts much longer than that, or the backup heat never seems to come on during cold snaps, schedule a visit.
Can a heating problem cause carbon monoxide?
It can. A cracked heat exchanger, a blocked or disconnected flue, or poor combustion can all let carbon monoxide into the house. Headaches, nausea or drowsiness that ease when you go outside are warning signs. Keep CO alarms near bedrooms, and if one sounds, get outside and call emergency services first.
What affects the cost of a repair?
Every heating repair starts with a $39 diagnostic visit (visits after 6pm, on holidays or for emergencies start at $250). After that, which part failed, whether it is on the truck or has to be ordered, how easy the equipment is to reach, and the age and make of the system all play a part, as does whether more than one component has failed. You approve the repair before any work begins, and financing options are available for larger jobs. If replacing is on the table, our HVAC price calculator shows what a new system would cost for your home.
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Experience the difference of working with a 5-star rated team that has served over 5,000 happy neighbors. Whether you need a seasonal HVAC tune-up or a high-efficiency system upgrade, we deliver honest assessments and guaranteed results backed by nearly two decades of industry expertise.
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