Aurora, CO Emergency HVAC: Heat Pump Not Heating?

Estimated Read Time: 9 minutes

A heat pump not heating on a cold Front Range morning can turn urgent fast. If your heat pump is not heating, use this guide to pinpoint the likely cause, handle safe DIY checks, and know exactly when to call in a pro. For true emergencies like smoke, sparks, or a strong gas odor, shut the system off and call Golden West 24/7 at (720) 504-3959.

Why Heat Pumps Stop Heating in Denver’s Climate

Denver’s high altitude, dry air, and fast-moving cold fronts push heat pumps hard. On single-digit days and icy nights, outdoor units can frost over faster, defrost cycles work overtime, and airflow restrictions show up quickly. Add cottonwood fluff in late spring and you have a perfect storm for poor performance if maintenance slips. The good news: most no-heat complaints trace back to a short list of issues you can triage in minutes.

• Thermostat settings or sensor errors
• Tripped breakers or outdoor disconnect issues
• Dirty filters and blocked supply or return vents
• Iced-over outdoor unit or failed defrost components
• Low refrigerant from a leak
• Stuck reversing valve or control board faults
• Weak blower motor, failed capacitor, or loose wiring

If you notice smoke, sparks, a strong gas smell, or the unit blowing only cold air for over an hour in heat mode, switch it off and call Golden West immediately at (720) 504-3959.

Quick Safety Checklist Before You Troubleshoot

Work through these steps to protect your system and family.

1. Turn the system off if you smell gas, see smoke, or hear electrical arcing. Call us 24/7.
2. Confirm the thermostat is on Heat and set 3 to 5 degrees above room temperature.
3. Check your electrical panel for a tripped breaker. Reset once only. If it trips again, call a pro.
4. Ensure the outdoor disconnect is fully seated on the heat pump.
5. Replace a dirty filter. Use the correct size and orientation arrow with airflow.
6. Clear 2 feet of space around the outdoor unit. Remove snow, leaves, and debris.

If the system restarts but still does not heat after 15 to 20 minutes, move to the next sections.

Thermostat and Control Issues

Thermostats drive heat pump staging, defrost timing, and auxiliary heat. Improper settings or failed sensors are common, low-cost causes of no-heat.

• Mode: Set to Heat. If you see EM Heat, understand it runs electric or gas backup and can be costly.
• Fan: Use Auto. On forces air that may feel cool if the coil is not warm.
• Schedule: Temporary holds can be stuck. Cancel holds and raise the setpoint.
• Batteries: Replace if the display is dim or unresponsive.
• Location: If the thermostat sits in direct sun or near a draft, it can misread by several degrees.

Still no heat? A miswired thermostat, failed temperature sensor, or control board problem may be at fault. Our licensed techs diagnose these quickly with proper meters and manufacturer procedures.

Airflow: Filters, Vents, and Return Restrictions

Heat pumps move a lot of air. Anything that blocks air reduces coil temperature and your comfort.

• Filter: If you cannot see light through the filter, replace it. In Denver, dusty winters and cottonwood season can clog filters fast.
• Vents: Open at least 80 percent of supply registers. Closing too many harms airflow.
• Returns: Keep furniture, rugs, and pet beds away from return grilles.
• Ducts: Listen for whistling or rattling that signals leaks. Big leaks starve the indoor coil of air.

If airflow improves but heat is still weak, the coil may be dirty or the blower motor capacitor could be failing. These are quick fixes with the right tools.

Outdoor Unit Iced Over or Not Defrosting

A light frost in cold weather is normal. A block of ice is not. If your outdoor unit looks like a snowball or you see thick ice covering the fan shroud or coil:

• Switch the system to Fan Only for 30 minutes to circulate indoor air.
• Gently remove loose snow around the base and clear the top grill. Do not chip ice.
• Check that downspouts do not dump water onto the unit. Redirect if needed.

Modern systems run a timed or demand defrost. If the defrost sensor, reversing valve, or control board fails, the unit will not clear ice and heating stops. We can test sensors, verify refrigerant charge, and confirm the reversing valve shifts under load, then repair or replace the faulty part.

Refrigerant Problems and Leaks

Low refrigerant reduces heat output and may trigger defrost more often. Symptoms include long run times, lukewarm supply air, and icing in cold weather. Refrigerant circuits are sealed. If charge is low, there is a leak.

What we do on site:

1. Inspect coils and line sets for oil stains that signal leaks.
2. Check superheat and subcooling to confirm charge against manufacturer specs.
3. Pressure test and, if needed, perform an electronic leak search.
4. Repair the leak, evacuate to 500 microns, then weigh in the correct charge.

Recharging without finding the leak is a temporary fix and risks compressor damage. We do it right the first time.

Reversing Valve, Capacitors, and Electrical Faults

If your heat pump runs but never gets warm, the reversing valve may be stuck in cooling. Capacitors that are weak can also prevent the compressor or fan from starting under load.

• Reversing valve: We verify coil temp changes when energized. If not, the valve or solenoid can be replaced.
• Capacitors: A bulged or leaking capacitor is unsafe. We test microfarads and replace with the correct spec.
• Wiring and relays: Loose connections and pitted relays cause intermittent heat. We tighten and replace as needed.

If you ever see sparks or smell burning plastic, shut it down and call for emergency service right away.

Auxiliary Heat Not Engaging

In very cold snaps along the Front Range, auxiliary electric heat or a gas furnace in a dual-fuel setup should assist the heat pump. If the house will not warm up and your utility bill spikes, aux heat might be stuck on or not coming on at all.

• Verify the thermostat is configured for your system type.
• Check breaker for electric heat strips.
• Listen for the indoor unit staging up when the setpoint is raised by 3 to 5 degrees.

We test heat strip amperage, stage calls at the thermostat, and verify gas furnace communication in dual-fuel installs.

When It Is an Emergency vs a Standard Repair

Call Golden West immediately at (720) 504-3959 if you experience any of the following:

• Smoke or sparks from the indoor or outdoor unit
• A strong odor of gas
• Loud, unusual noises or a grinding sound
• Heat pump blowing only cold air for over an hour in heating mode
• Visible refrigerant leak or heavy icing that stops the fan

For standard no-heat issues without safety risks, we can schedule same-day or next-day appointments with no overtime fees. Our fully stocked vehicles often complete repairs on the first visit.

DIY Fixes You Can Try Today

These steps solve many common heat pump heating issues without tools.

1. Replace the air filter and open closed supply registers.
2. Set the thermostat to Heat, Auto fan, and raise the setpoint.
3. Reset a tripped breaker once. If it trips again, stop and call.
4. Gently clear snow and debris from the outdoor unit and ensure 2 feet of clearance.
5. Power cycle: Turn the heat pump off at the thermostat, wait 60 seconds, then back on.

If the home does not warm within 20 minutes, professional diagnostics protect your equipment and energy costs.

What to Expect From a Golden West Service Call

We start with a safety check, then move quickly to root-cause diagnostics.

• On-time arrival, shoe covers, and floor protection
• Clear explanation of findings and upfront pricing
• Your approval required before any work begins
• Repairs completed same day whenever possible
• Post-repair test and thermostat calibration

We back our tune-ups with a 6-month No-Breakdown Guarantee. If your system fails within 6 months of our maintenance, we come back at no cost to diagnose, give you priority scheduling, and credit the original tune-up toward the repair.

Prevention: Maintenance That Reduces No-Heat Calls

Two short tune-ups a year keep heat pumps reliable and efficient.

• Clean and inspect indoor and outdoor coils
• Test capacitors, contactors, relays, and defrost sensors
• Verify charge via superheat and subcooling
• Lubricate moving parts and check blower wheel balance
• Tighten electrical connections and measure voltage drop
• Replace or wash filters and confirm airflow at registers
• Test thermostat and communication with auxiliary heat

Golden West VIP Members get annual maintenance for heating and cooling, reminders, priority service, and savings on repairs. Most surprise no-heat calls trace back to skipped maintenance.

Local Insight for Denver, Aurora, Lakewood, and Nearby

• High altitude and dry air show up as static and dust that clog filters faster. Check monthly in winter.
• Cottonwood season can blanket outdoor coils. Inspect and rinse from the inside out as needed.
• After snow, keep 2 feet around the outdoor unit clear. Avoid roof melt-water draining onto the unit.
• In older homes in Arvada, Thornton, and Westminster, undersized returns are common. We can add returns to improve comfort.

Whether you are in Denver, Aurora, Lakewood, Thornton, Arvada, Boulder, Westminster, Centennial, Lafayette, or Castle Rock, our 24/7 team is ready the moment your heat pump is not heating.

Transparent Pricing and Financing Options

We provide upfront pricing before work begins and never charge overtime. Financing is available on qualifying repairs and replacements with approved credit. Ask about pairing a high-efficiency heat pump with a smart thermostat for comfort and energy savings during Front Range shoulder seasons.

When to Repair vs Replace

Consider replacement when any of the following apply:

• Your heat pump is over 12 to 15 years old and needs a major component
• Repeated refrigerant leaks or obsolete refrigerant
• Rising energy bills despite recent repairs and clean filters
• The repair cost exceeds 25 to 40 percent of replacement

We compare options side by side, including utility incentives when available, and size systems correctly for Denver’s climate to avoid short cycling and weak heating.

Ready for Fast, Qualified Help?

If your heat pump is not heating, we can dispatch a licensed technician today. With 24/7 live answering, A+ BBB rating, and 1,500+ 5-star reviews, you get proven service without surprises. Call (720) 504-3959 for emergencies or schedule online at goldenwestph.com.

What Homeowners Are Saying

What Homeowners Are Saying

"Called Golden West for an emergency furnace repair. They sent a technician quickly and had it fixed to work through the night, and returned for a full repair the next day. Excellent service! Average cost for repair, and thankful they didn't try to upsell me. Would definitely recommend them and will use them again!"
–Denver Homeowner

"When I call with an emergency, someone always shows up to your home the same day. I called several companies and they could not put me on their schedule for 48 hours. That doesn't work when you don't have heat on one of the coldest days of the year. Thank you Golden West!"
–Aurora Homeowner

"Anthony was amazing. Showed up after hours eager and happy to help. Fixed the problem within 30 min. Anthony was super knowledgeable and polite. Great technician doing great work."
–Lakewood Homeowner

"It took him less than 25 minutes to remedy the situation and get our heat back up and running on a very cold day. Same day service, was very appreciated! Would definitely use them again."
–Arvada Homeowner

Frequently Asked Questions

Why is my heat pump blowing cool air in heat mode?

Heat pumps deliver air cooler than body temperature, so it can feel lukewarm. If rooms do not warm after 20 minutes, check the filter, mode, and setpoint. If still cool, call for service.

Is ice on my outdoor unit normal in winter?

A light frost is normal. A solid block of ice or a fan that stops due to icing is not. Turn the system off and call for service to check defrost components and refrigerant charge.

Should I use emergency heat when it is very cold?

Only if the heat pump is not heating or has failed. Emergency heat uses backup electric or gas and can be expensive. If you rely on EM Heat, schedule a repair.

How often should I replace my heat pump filter in Denver?

Check monthly in winter and during cottonwood season. Replace every 1 to 3 months based on dust levels, pets, and filter type.

When is a heat pump problem an emergency?

Shut the system off and call 24/7 if you see smoke or sparks, smell gas, hear loud grinding, or the unit blows only cold for over an hour in heat mode.

In Summary

If your heat pump is not heating, start with safe DIY checks, then call in proven help for refrigerant, defrost, or electrical issues. Denver’s climate is tough on heat pumps, but with smart troubleshooting and routine maintenance you can restore comfort fast and reduce surprise breakdowns. For 24/7 emergency HVAC in Denver, call Golden West today.

Schedule Now

• Emergencies: Call 24/7 at (720) 504-3959. No overtime fees.
• Book service online: https://www.goldenwestph.com/
• Prefer to talk first? Call our local team at 720-613-8880. We answer live, day or night.

Get fast, on-time service from licensed techs, backed by our A+ BBB rating and 1,500+ 5-star reviews. Restore your heat pump’s performance today.

About Golden West Plumbing, Heating, Air Conditioning, and Electrical

For 22+ years, Golden West has kept Denver-area homes safe and comfortable. We offer 24/7 emergency service, live local answering, and no overtime fees. Our licensed HVAC technicians service all major heat pump brands. We’re A+ rated by the BBB and backed by 1,500+ 5-star Google reviews. VIP Maintenance Members get priority service and savings, plus our tune-up No-Breakdown Guarantee for 6 months. We arrive on time, protect your home, provide upfront prices, and never start work without your approval.