Newmarket, NH Emergency HVAC: Heat Pump Not Heating?

Estimated Read Time: 9 minutes

Heat pump not heating during a New Hampshire cold snap? You are not alone. When your system blows cool air or cannot keep up, the problem is usually fixable with a few targeted checks. Below, we outline fast homeowner steps, the most common failures we see across Nashua, Manchester, and nearby towns, and when to call for professional help. Members get priority emergency access and extended warranty coverage.

How Heat Pumps Heat Your Home in Cold Weather

A heat pump moves heat rather than creating it. In heating mode, the outdoor unit pulls heat from outside air and the indoor unit delivers it into your home. On very cold days, your system may run longer and rely on backup heat strips or a furnace in a dual-fuel setup. Short cycling, constant fan, or frost that never clears are signs something is off.

Key parts at play include the thermostat, reversing valve, outdoor fan, compressor, refrigerant charge, sensors, and defrost controls. When any of these drift out of spec, the result can look like lukewarm or cold air from the vents.

Quick Checks You Can Do In Five Minutes

Before you schedule service, try these safe checks:

1. Thermostat
   • Confirm Heat mode, not Cool or Fan Only.
   • If you have auxiliary heat, set temperature 3 to 5 degrees above room temp to trigger it.
2. Airflow
   • Replace or clean the air filter if it looks dark or clogged.
   • Open at least 80 percent of supply registers. Unblock returns.
3. Outdoor unit
   • Clear snow, leaves, or ice from the top and sides. Maintain at least 18 inches of clearance.
   • If there is a light, even frost, give it 15 minutes. The defrost cycle should clear it.
4. Breakers
   • Check the heat pump and air handler breakers. Reset only once if tripped.
5. System reset
   • Turn the system Off for 60 seconds, then back to Heat. Listen for the outdoor unit.

If these do not help, you likely have a component, refrigerant, or control issue that needs a pro.

Thermostat and Control Issues That Stop Heating

Incorrect settings or faulty controls are common when a heat pump is not heating.

• Wrong mode or schedule: A recent schedule change can force setback temperatures. Disable temporary holds and reselect Heat.
• Heat strips not engaging: In very cold weather, auxiliary heat should kick in. If it does not, a relay, sensor, or strip may be faulty.
• Reversing valve stuck: This valve switches between Heat and Cool. If stuck, you may feel cool air even in Heat mode.
• Miswired or aging thermostat: Loose wires or misconfiguration can prevent heating calls.

Pro tip for NH winters: If your thermostat has an Emergency Heat option, use it only if instructed. It bypasses the outdoor unit and runs electric heat strips. It is helpful in a failure but expensive to run.

Outdoor Unit Problems: Frost, Ice, and Fan Failures

Some frost in winter is normal. Your heat pump defrosts automatically by reversing briefly to cooling and using outdoor fan control.

Issues to watch for:

• Thick ice shell that does not clear: A failed defrost sensor, control board, or reversing valve can stop defrost.
• Outdoor fan not spinning: A failed fan motor or capacitor can halt heat transfer. The indoor air will feel cool.
• Blocked coil: Cottonwood, leaves, or snow drifts reduce airflow. That forces long run times and cold vents.
• Bent fins or debris: Damaged fins choke the coil. A professional fin comb and cleaning restore performance.

If you see heavy ice or a quiet outdoor unit in freezing weather, shut the system off and call. Prolonged operation can damage the compressor.

Refrigerant and Airflow: Two Big Drivers of Poor Heat

Undercharge or restrictions starve the system of heat. Overcharge can be just as bad.

• Low refrigerant: Often due to a small leak. Symptoms include longer cycles, hissing, and reduced heat. EPA rules require proper recovery and charging by certified technicians.
• Dirty indoor coil: A matted coil blocks heat delivery. This often pairs with a clogged filter history.
• Duct issues: Disconnected or undersized ducts in attics or basements waste heat. Sealing and balancing can add several degrees to supply air.

These problems need gauges, probe thermometers, and leak detection. A correct fix includes locating the leak, repairing it, and then weighing in the proper charge.

Electrical and Safety Triggers

Electrical faults can present as no heat.

• Tripped breaker: Frequent trips signal a shorted component or overcurrent. Do not keep resetting.
• Failed capacitor or contactor: Common wear items that stop the compressor or fan from starting.
• Limit or pressure switches: Safety devices open when temperatures or pressures are out of range. That can lock out heating until the root cause is fixed.

If the breaker trips again immediately or you smell burning, turn the system off and call for help.

Signs Your Heat Pump Issue Is an Emergency

You should call immediately if you notice any of the following:

• The breakers continue to trip.
• Water around the unit or air handler.
• Loud sounds each time it runs.
• No heat during a freeze warning, especially with vulnerable occupants.
• Smoke, sparking, or a burning smell.

Emergency AC Services on our site state, "We understand that AC problems can arise unexpectedly and require immediate attention. Paul The Plumber offers emergency AC repair services to address urgent issues promptly and effectively." The same urgency applies to heat pumps when heat is down in extreme cold.

What Our Technicians Do On Arrival

Our process is built to find the problem quickly and fix it right the first time.

• Diagnosis and Troubleshooting: "Our process starts with a thorough diagnostic evaluation to accurately identify the source of the problem."
• Component Repairs: "We handle all types of air conditioning repair services, including compressor issues, refrigerant leaks, faulty fans, and thermostat problems." These issues closely mirror heat pump faults.
• System Optimization: "After addressing the immediate repair needs, we focus on optimizing your air conditioning unit to enhance its efficiency." Post-repair optimization applies to heat pumps as well.
• Preventative Maintenance: "To help avoid future breakdowns and extend the life of your AC unit, we offer comprehensive maintenance services."

You will receive upfront pricing before work begins. We back our repairs with a 2-year parts and labor warranty, which can be extended to 3 years with membership.

Member Priority and After-Hours Access

Our emergency policy is designed to protect comfort when it matters most. "Emergency services available for members only, see Membership and Maintenance Plans for details." Members receive priority scheduling, no dispatch fee on eligible visits, and exclusive savings on repairs. This means faster help during a storm or after-hours call.

If you are not yet a member, we can still schedule the earliest standard appointment and discuss options to activate benefits.

DIY vs Pro: When to Stop Troubleshooting

Try the five-minute checks once. Stop and call if any of these occur:

• The outdoor unit is silent or humming but not starting.
• Ice encases the outdoor coil or lines.
• Breakers trip twice.
• Supply air is below room temperature after 10 minutes of run time.
• You suspect a refrigerant leak.

Continuing to run a struggling system can turn a minor part failure into a compressor replacement.

Cost, Timelines, and What to Expect in New Hampshire

Every home and system is different, but here is what most homeowners experience in our service area:

• Same-day or next-day standard appointments in Nashua, Derry, and Manchester. Members often receive same-day priority, including after hours.
• Common repairs such as capacitors or contactors are often completed in one visit.
• Refrigerant leak checks and coil cleanings can take longer due to testing and recovery requirements.
• Upfront pricing with options. You approve the work before we begin.

We work in basements with bulkhead access, tight utility closets in townhomes, and older homes in Concord and Portsmouth. Our team protects floors, wears shoe covers, and cleans the area before leaving.

Preventative Maintenance That Pays Off

A tuned heat pump runs warmer, quieter, and lasts longer. Our maintenance visit typically includes:

1. Electrical testing of contactors, capacitors, and motors.
2. Coil cleaning and drain clearing.
3. Refrigerant performance check.
4. Thermostat calibration and control board review.
5. Duct inspection for common leaks and airflow issues.

Members receive scheduled seasonal visits and priority service when weather turns extreme. Many no-heat calls start with airflow blockages or a failing capacitor that we can catch early.

Repair or Replace: Making the Smart Call

Consider replacement when:

• Your unit is 12 to 15 years old and needs a major repair.
• Repeated refrigerant issues point to coil corrosion.
• The system cannot maintain setpoint in average winter weather.

Consider repair when:

• The unit is under 10 years old with a single failed component.
• Airflow and defrost issues are the main problems.
• Operating noise and performance were previously normal.

We provide side-by-side options with total cost of ownership. Many homeowners choose repair now and plan a high-efficiency upgrade later when incentives align.

How Paul The Plumber Handles Your Call

From the first hello to the final test run, we follow a proven process.

1. Schedule and triage
   • We confirm symptoms, location, and access.
   • Members are placed in a priority queue for faster dispatch.
2. On-site diagnosis
   • A licensed, background-checked technician performs system testing and safety checks.
   • We present clear findings and upfront pricing.
3. Repair and verification
   • We replace failed parts, correct charge, and resolve control issues.
   • We verify supply temperature rise and system operation in Heat.
4. Optimization and wrap-up
   • We review filter changes, thermostat settings, and maintenance intervals.
   • You get documentation of work performed and warranty details.

Our company is BBB accredited with an A+ rating, and we stand behind our work with a 2-year parts and labor warranty. Members can extend that to 3 years under Paul’s Promise Plan.

Common Causes Summary Checklist

Use this as a quick reference the next time your heat pump struggles:

• Wrong thermostat mode or schedule conflict.
• Clogged filter or blocked registers and returns.
• Outdoor fan not spinning or heavy ice on the unit.
• Low refrigerant due to a leak, or dirty coils.
• Failed capacitor, contactor, or stuck reversing valve.
• Safety or pressure switch lockout after extreme conditions.

If the system still will not heat after the quick checks, schedule service before the next cold front. Early fixes are faster and cheaper than emergency replacements.

Special Membership Benefits for Faster Heat Restorations

Join Paul’s Promise Plan to protect comfort during peak cold. Members receive priority scheduling, including after hours and weekends, no dispatch fee on eligible visits, up to 4 maintenance visits per year, and a 10% discount on service and repairs. Emergency services available for members only, see Membership and Maintenance Plans for details. Call (603) 541-7986 or visit https://www.paultheplumbernh.com/ to enroll before the next cold snap.

What Homeowners Are Saying

"Exceptional experience at a great cost! When our central air stopped working during a heat wave, Paul the Plumber was the first available to help, and didn't charge a crazy "emergency fee" like some companies. Communication was flawless start to finish. Nick L. assessed the problem and got everything back up in running within hours. Wouldn't think twice about calling them again. Honestly, one the most courteous companies I've worked with."
–Kevin M., Emergency HVAC

"Excellent response time on my emergency. Technician was here on time and did a great job. Very pleased and would recommend them"
–Rand K., Emergency HVAC

"Quick response to an emergency and a quick/friendly fix by Dave. Well done and thank you!"
–Hetz W., Emergency HVAC

"Showed up with 2 hours after calling with semi emergency. Ryan P is the best!"
–Dan B., Emergency HVAC

Frequently Asked Questions

Why is my heat pump blowing cold air in Heat mode?

Your system may be in defrost, have a clogged filter, low refrigerant, a stuck reversing valve, or auxiliary heat not engaging. Try the quick checks, then call if it persists.

How cold is too cold for a heat pump in New Hampshire?

Modern systems work in freezing weather but run longer. In extreme cold, they rely on auxiliary heat. If it cannot reach setpoint, schedule a diagnostic visit.

Should I use Emergency Heat when the heat pump fails?

Use it only if the outdoor unit is down or a technician instructs you. It uses electric strips that are safe but expensive to run.

What if my outdoor unit is covered in ice?

Light frost is normal. Thick ice that does not clear signals a defrost failure. Turn the system off and call to avoid compressor damage.

Do you offer emergency heat pump repair?

Yes, with a membership. Emergency services available for members only. Members receive priority scheduling and savings. Call (603) 541-7986 for details.

A heat pump not heating usually comes down to controls, airflow, or a failed component. Quick checks can restore comfort, but heavy ice, tripping breakers, or silent outdoor units need a pro. For fast, expert help in Nashua, Manchester, and nearby towns, call Paul The Plumber. Members receive priority emergency access and extended warranty coverage that keeps your home warm and your budget predictable.

Call now for priority heat pump service: (603) 541-7986. Join Paul’s Promise Plan for 10% off repairs, no dispatch fee on eligible visits, and faster emergency response. Or schedule online at https://www.paultheplumbernh.com/. Restore heat today and prevent the next outage with a maintenance visit.

Paul The Plumber is New Hampshire’s trusted home-service team for HVAC and plumbing. We are BBB accredited with an A+ rating and thousands of 5‑star reviews. Our licensed, background-checked technicians deliver upfront pricing, clean workmanship, and a 2-year parts and labor warranty that extends to 3 years for members. Ask about Paul’s Promise Plan for priority service and exclusive savings.