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Frequently Asked Questions about Furnace Repair

Having problems with your heating system? Get answers to common questions about furnace repair and find trusted local technicians.

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

A correctly sized furnace is essential for efficient and comfortable heating. An too-small furnace won't adequately heat the space. An oversized furnace will short cycle, causing wear and tear, inconsistent heating, and inflated utility bills. Signs that your furnace may not be correctly sized include::
  • High Energy Bills: An incorrectly sized furnace can lead to increased energy consumption.
  • Inconsistent Temperatures: Noticeable temperature fluctuations between rooms.
  • Short Cycling: If your furnace turns on and off frequently, it could be an indication 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: A furnace that's too large can make loud or unusual sounds
If you suspect your furnace is improperly sized, it's essential to consult with an HVAC professional. Ask a professional for a load calculation to confirm appropriate sizing. Installing the correct size unit will maximize efficiency and minimize energy bills.

What is the difference between a single-stage and two-stage furnace?

Single-stage and two-stage furnaces differ in their heating output capabilities:
Single-stage furnaces operate at only one output level – full capacity. This can lead to temperature fluctuations and higher energy bills because the temperature fluctuates more than with two-stage furnaces.
Two-stage furnaces can run at both low and high speed. They work by running at a lower speed most of the time and switching to high speed when necessary.Two-stage furnaces provide enhanced home comfort and energy savings compared to single-stage models.

What are the different types of furnaces?

The most common types of furnaces are classified by their fuel source:
  • Natural Gas Furnaces: These are the most popular type, fueled by natural gas, which is generally readily available and relatively affordable in many areas. Natural gas furnaces tend to be efficient and have lower operating costs compared to oil or propane furnaces.
  • Propane Furnaces: Propane furnaces are similar to natural gas furnaces These are a good option in areas where natural gas isn't accessible.
  • Oil Furnaces: Oil furnaces are less common than gas or propane furnaces but still used in certain regions. They require more maintenance and tend to be less efficient than gas furnaces.
  • Electric Furnaces: Electric furnaces use electric resistance heating elements to generate heat.. Their installation cost is usually lower, but electricity prices can affect operating costs significantly.
An HVAC professional can help you determine the best type of furnace for your home or business.

Why is my furnace blowing cold air?

Possible reasons for cold air include:
  • Pilot light or ignition problems: If the pilot light is out, the burners won't light, and the furnace won't produce heat. In newer furnaces, a faulty electronic ignition system can prevent the burners from igniting.
  • Thermostat issues: A faulty thermostat can prevent the furnace from turning on or cause it to cycle improperly. Check your thermostat settings to ensure the system is set to 'heat' and the temperature setting is higher than the current room temperature.
  • Overheating: If the furnace overheats, a safety switch may shut off the burners, causing the blower to circulate cold air.. Overheating can also damage your furnace, so it's best to have a professional inspect the system.
  • Ductwork problems: Leaks in your ductwork can allow heated air to escape into unconditioned spaces, reducing the amount of warm air that reaches your rooms.. Poorly insulated or leaky ducts can cause a variety of heating issues.
If you're not able to identify the cause and fix the problem yourself, contact a furnace repair professional.

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

A correctly sized furnace is essential for efficient and comfortable heating. An too-small furnace will constantly run and struggle to heat your home effectively, especially in cold weather.. An oversized furnace will short cycle, causing wear and tear, inconsistent heating, and inflated utility bills. Signs that your furnace may not be correctly sized include::
  • High Energy Bills: An oversized furnace can lead to increased energy consumption.
  • Inconsistent Temperatures: Noticeable temperature differences between rooms.
  • Short Cycling: If your furnace cycles 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: A furnace that's too large 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. A proper sizing calculation is a worthwhile investment for optimal comfort and energy efficiency.

What is the difference between a single-stage and two-stage furnace?

Single-stage and two-stage furnaces differ in their heating output capabilities:
Single-stage furnaces have only one setting, they either operate at 100% or are off. This can lead to uneven heating and fluctuating bills because the temperature fluctuates more than with two-stage furnaces.
Two-stage furnaces can run at both low and high speed. They work by running at a lower speed most of the time and switching to high speed when necessary. A two-stage furnace may be a more expensive initial investment, but it can provide greater comfort and savings over time.

What are the different types of furnaces?

The most common types of furnaces are classified by their fuel source:
  • Natural Gas Furnaces: fueled by natural gas Natural gas furnaces offer cleaner energy, especially compared to oil.
  • Propane Furnaces: Propane furnaces are similar to natural gas furnaces These are a good option in areas where natural gas isn't accessible.
  • Oil Furnaces: Oil furnaces are less common than gas or propane furnaces but still used in certain regions. They require more maintenance and tend to be less efficient than gas furnaces.
  • Electric Furnaces: Electric furnaces are fueled by electricity. They are typically less expensive to purchase than gas furnaces, but they can be more expensive to operate depending on your electricity rates.
Other less common types of furnaces include modulating furnaces (which offer variable heating output for better efficiency) and dual-fuel or hybrid systems (which combine a heat pump with a furnace for enhanced performance in all climates).

Why is my furnace blowing cold air?

Several problems can cause your furnace to blow cold air::
  • Pilot light or ignition problems: In older furnaces, the pilot light needs to be lit for the burners to ignite. In newer furnaces, a faulty electronic ignition system can prevent the burners from igniting.
  • Thermostat issues: A faulty thermostat can prevent the furnace from turning on or make it blow cold air. Check that your thermostat to ensure the system is set to 'heat' and the temperature setting is higher than the current room temperature.
  • Overheating: If the furnace overheats, a safety switch may shut off the burners, causing the blower to circulate cold air.. Overheating can also damage your furnace, so it's best to have a professional inspect the system.
  • Ductwork problems: Seal any ductwork leaks to improve performance. This can also result in the furnace blowing cold air, especially if the leak is near the beginning of the ductwork run.
If you're not able to identify the cause and fix the problem yourself, contact a furnace repair professional.