Furnace Repair Portsmouth

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Frequently Asked Questions about Furnace Repair

Is your furnace acting up? Get answers to common questions about furnace repair and find trusted local technicians.

How often should I change my furnace filter?

It's recommended to change your furnace filter every 1-3 months, or more often if you have pets, allergies, or live in a high-pollution area. Regularly replacing filters is simple and helps prevent many furnace problems. Check your filter monthly and change it as needed.

What is a pilot light?

A pilot light is a small, continuous flame used to ignite the main burners. It's how older furnaces ignite the gas. Most modern furnaces use an electronic ignition system. While pilot lights are generally reliable, they're not as efficient as newer ignition systems They also consume a small amount of gas continuously, even when the furnace is not actively heating. .

What are the most common furnace problems?

Common furnace problems can include::
  • No Heat or Reduced Heat Output: This can be caused by a variety of issues.
  • Strange Noises: Unusual sounds like banging, squealing, or rumbling can indicate problems with the blower motor, igniter, or other components.
  • Short Cycling: This is when the furnace turns on and off rapidly, which can be caused by a faulty thermostat, an overheating furnace, or a clogged air filter.
  • Pilot Light/Ignition Problems: Make sure your pilot light is on, or your ignition system is functioning correctly.
  • Blower Motor Issues: If the blower motor isn't functioning, your furnace may not distribute heat properly. A malfunctioning blower motor can cause reduced airflow, uneven temperatures, and loud noises. should be addressed by a technician.
  • Dirty Air Filter: A dirty filter restricts air circulation. It may lead to more serious problems.
  • Cracked Heat Exchanger: This is a serious safety hazard, as it can lead to dangerous gasses entering your home. This is considered an emergency.
If you are experiencing any of these issues, it is important to contact a qualified HVAC professional for diagnosis and repair.

How can I tell if my furnace is the correct size for my home?

A properly sized furnace is crucial for efficient and comfortable heating. An undersized furnace will constantly run and struggle to heat your home effectively, especially in cold weather.. An oversized furnace will cycle on and off too frequently, wasting energy and shortening the system's lifespan.. Here are some signs your furnace may be improperly sized:
  • High Energy Bills: An oversized furnace can cause increased energy consumption.
  • Inconsistent Temperatures: Noticeable temperature differences throughout your home.
  • Short Cycling: If your furnace turns on and off frequently, it may not be heating your space efficiently and wasting energy.
  • Poor Air Quality: If the airflow from the vents seems weak or there are hot and cold spots, the unit may be the wrong size.
  • Excessive Noise: Oversized furnaces may produce more noise than normal.
A qualified technician will be able to assess your home's heating needs. A Manual J load calculation can accurately determine the appropriate furnace size.. A proper sizing calculation is a worthwhile investment for optimal comfort and energy efficiency.

How often should I change my furnace filter?

It's recommended to change your furnace filter every 1-3 months, or more often if you have pets, allergies, or live in a high-pollution area. Regularly replacing filters is simple and helps prevent many furnace problems. A clogged filter makes your furnace work harder, wasting energy and shortening its lifespan.

What is a pilot light?

A pilot light is a tiny flame used in older furnaces. It's how older furnaces ignite the gas. Most modern furnaces use an electronic ignition system. While pilot lights are generally reliable, they can sometimes go out or malfunction, requiring relighting or repair. Electronic ignition systems are usually safer and more efficient.

What are the most common furnace problems?

Common furnace problems can include::
  • No Heat or Reduced Heat Output: This can be caused by a faulty thermostat, a clogged air filter, or a malfunctioning igniter.
  • Strange Noises: Listen for any sounds out of the ordinary.
  • Short Cycling: This is when the furnace turns on and off too frequently, reducing efficiency and potentially causing damage.
  • Pilot Light/Ignition Problems: Make sure your pilot light is on, or your ignition system is functioning correctly.
  • Blower Motor Issues: If the blower motor isn't functioning, your furnace may not distribute heat properly. A malfunctioning blower motor can cause reduced airflow, uneven temperatures, and loud noises. requires attention.
  • Dirty Air Filter: A clogged air filter reduces airflow and decreases furnace efficiency. . It may lead to more serious problems.
  • Cracked Heat Exchanger: This is a serious safety hazard, as it can lead to dangerous gasses entering your home. A cracked heat exchanger needs to be repaired or replaced immediately.
If you are experiencing any of these issues, it is important to contact a qualified HVAC professional for diagnosis and repair.

How can I tell if my furnace is the correct size for my home?

A correctly sized furnace is essential for optimal home comfort. An undersized furnace will constantly run and struggle to heat your home effectively, especially in cold weather.. An oversized furnace will cycle on and off too frequently, wasting energy and shortening the system's lifespan.. Signs that your furnace may not be correctly sized include::
  • High Energy Bills: An incorrectly sized furnace can cause increased energy consumption.
  • Inconsistent Temperatures: Noticeable temperature fluctuations between rooms.
  • Short Cycling: If your furnace turns on and off frequently, it may not be heating your space efficiently and wasting energy.
  • Poor Air Quality: If the airflow from the vents seems weak or there are hot and cold spots, the unit may be the wrong size.
  • Excessive Noise: Oversized furnaces may produce more noise than normal.
A qualified technician will be able to assess your home's heating needs. Ask a professional for a load calculation to confirm appropriate sizing. Installing the correct size unit will maximize efficiency and minimize energy bills.