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When to Replace Your Furnace?

One of the biggest issues a homeowner can face is when to keep repairing a furnace or when it is time replace it. Its not an easy decision oftentimes causing home owners many a sleepless night but in this article we can provide you with some help in making the decision to replace the heart of any home, your furnace.

These can range from many signs, age of your system, sudden temperature changes, loss of heat on the coldest days, the inability of your furnace to reach a comfortable temperature, loud noises or an ever increasing cost to run your furnace beyond what it was in past years. Any one of these or several together together may mean its time to replace your old furnace with a newer, more energy efficient furnace. When that time does happen make sure to call a licensed professional who can walk you through the steps, present educated options on the type of furnace you need and provide a cost effective solution.


There are many noises that may be telling you it’s time to repair or replace your old furnace. Repair or replace what should I do? Common noises such as rattling, popping, humming, and screeching are signs you need a new furnace. You may also want to consider switching from a furnace to another heating source such as boilers, heat pumps, or ductless mini-split systems to save money on your utility bills.


  • Popping: This is caused by fluctuations in temperature within your furnace. The popping noise is caused by parts that are affected by the temperature change
  • Rattling: A rattling sound may be caused by loose ducts or equipment. Contact a professional HVAC contractor to discuss if it’s time to replace your furnace
  • Screeching: This type of noise indicates a damaged furnace blower motor. However, it can also be caused by a damaged belt or the pulley on your old furnace
  • Humming: This sound is caused by the furnace blower motor throughout standard operation. If this noise is becoming noticeably loud, this is an indicator its time to invest in a new furnace
  • Clicking: A clicking noise may indicate your flame sensor or igniter needs to be fixed. Luckily, this type of sound is common and is often able to be fixed by performing a standard furnace repair
  • Booming: A booming sound may be a sign of a severe gas emission issue with your furnace. This noise is often caused by a brief delay during the ignition process. However, a lingering gas odor smell is a clear indicator that it’s time to hire a professional to perform a furnace replacement in your home.


Are you wondering when it’s time to replace your furnace? Sudden changes in temperature between varying rooms of your home are a clear sign it’s time consult with a licensed contractor about performing a repair. On the other hand, noticeable temperature shifts can be a sign it’s time to start researching new furnaces. Once an old furnace reaches it’s 15 year mark, it will slowly start to become less efficient and will lose its ability to distribute heat evenly throughout the upper and lower floors of your home.


If you own a home, you are aware of how unpleasant it may be to find soot or dust lingering throughout your kitchen, bathrooms, or bedrooms. Soot and dust is usually accompanied by dry air in the home that can potentially damage wood flooring, couches, chairs, or shelves. If you notice dead plants in your house, this is a signal of a low amount of moisture in the air. Excess dust and soot throughout the home is an indication that your old furnace is producing too much Carbon Dioxide. This soot buildup is commonly found near the furnace register and grille. A register is an air duct cover that is able to regulate airflow throughout the home. If you notice dirt or soot around the furnace register, this is a common warning it’s time to consider replacing your furnace.


The life expectancy of a furnace is about 15 years, after this you will see that your previously warm home has become a series of hot and cold spots because your aging furnace just can’t supply a consistent heat source. This in turn will drive your monthly heating costs beyond previous maximums. If you’re wondering when its time to perform a furnace replacement, take a look at the total cost of your next repair. If the total cost of the repair is more than half the cost of putting in a new furnace, then it may be time to consider a replacement and possibly consider making a change to your heating option, such as radiant heating, Mitsubishi ductless, or zone control systems.

If you have a furnace in service for 10 years or less, it’s recommended to perform a repair on your old furnace to fix common issues. You can use a simple calculation to give you a sense of when a furnace repair is worth it: take the cost of the repair and multiply it by the age of the furnace, and if the result is less than 5,000, the repair isn’t too expensive. I.E., if you have a furnace that’s 7 years old, and it needs repairs to its burners that costs $400, the repair is probably worth it. (7 x 400 = 2,800.)


An efficiently working furnace will always produce a clean blue flame to heat your home. If the flames coming from the burners are yellow, is may be an indicator that your old furnace is producing carbon monoxide. Yellow flames may also be a sign of a dangerous gas leak that needs to be repaired or an improper combustion process. If you notice yellow flames in your old furnace accompanied by a gas odor, immediately give us a call by phone at (603) 303-5310 or schedule an appointment online. We offer furnace repair and installation services in areas of Southern New Hampshire such as Derry, Merrimack, Litchfield, Bedford, Manchester, Nashua, Salem Amherst, Milford and many more.


If you’re already shelling out annually to fix your old furnace, you can put a stop to those extra fees right away with a replacement. CHS offers HVAC repair services such as furnace installation, boiler replacement, and heat pump install. Our team of licensed HVAC Technicians are also trained to fix broken air-conditioners and water heaters. Schedule an appointment to receive assistance today. Complete Home Services. serves Southern NH and parts of Massachusetts


CALL Complete Home Services: (603) 303-5310