Do Furnaces Lose Efficiency Over Time? Essential Guide 


Natural gas and oil furnaces are a popular choice for home heating systems. But, is your furnace losing efficiency over time? As furnaces age, they need maintenance to keep running efficiently. Here’s a look at warning signs: it’s time to replace your old furnace. We’ll also cover the costs and when it’s better to invest in new equipment than keep repairing the old one.

Old furnaces can cause various problems. These include carbon monoxide leaks, poor air quality, frequent repairs, costly bills, and discomfort. Notice excessive dust, or if your furnace is nearing its typical lifespan? It may be time for a new one.

At Gilmore Heating, our qualified technicians recommend annual maintenance services. This ensures peak efficiency and a safe environment for you and your family. We recently serviced an old oil burner unit. There were multiple repairs needed, like a motor failure and an unbalanced motor. Plus, risky connections during the inspection process. These repairs cost the customer a lot. Investing in an efficient home heating system with protection plan options from energy utility companies can be wise.

Keep track of any strange noises or smells from your furnace during operation. Signs like pilot lights going out, or warm air turning cold can point to issues. Replacing the filter regularly will ensure clean heated air blows through ductwork. If you have frequent headaches, dry nose or throat, or flu-like symptoms, it may be due to poor indoor air quality or carbon monoxide emissions from the old gas furnace.

It’s important to be proactive and stay ahead of potential furnace issues. With regular maintenance and the right service plan in place, you can maintain a healthy home environment and keep energy bills low. Purchasing a new furnace offers great financing options and efficient heating. Don’t panic and consult with our expert HVAC company technicians. They can help you find the perfect replacement furnace suited to meet your needs.

Furnace efficiency matters – it can save you money and headaches in the long run!

Do Furnaces Lose Efficiency Over Time

Importance of Furnace Efficiency

To ensure that your heating system provides comfortable and adequate warmth during the cold season, you need to pay attention to the efficiency of your furnace. In this section, we will discuss the importance of furnace efficiency and explore some important aspects of it. We will start with an explanation of what Annual Fuel Utilisation Efficiency (AFUE) is, followed by why AFUE is important for a furnace. From there, we will differentiate between high and low-efficiency furnaces to help you make a wise decision for your home heating system.

What is Annual Fuel Utilisation Efficiency (AFUE)?

Annual Fuel Utilisation Efficiency (AFUE) is a term that calculates the energy efficiency of your furnace. It works out how much fuel gets used for heat and how much is wasted energy. A higher AFUE rating means more efficiency. Modern heating systems usually have an AFUE rating between 80-95%.

When picking a new furnace, take the AFUE rating into account. It might cost more to start with, but you can save money in the long run. Reduced energy use and cheaper fuel bills are worth it.

Don’t forget that regular maintenance is just as important as having a high AFUE rating. Change air filters and lube moving parts to improve performance and extend the life of your furnace.

Pro Tip: Have a professional inspect your furnace every year. To make sure it’s running at its best, and to spot any issues before they become worse.

Why settle for heating your home? Get more bang for your buck by toasting marshmallows with your furnace’s inefficiency!

Why is AFUE important for a furnace?

Considering an AFUE rating when buying a furnace is important. AFUE stands for Annual Fuel Utilisation Efficiency. It measures the amount of fuel converted to usable heat. High AFUE ratings mean more efficiency and lower energy costs. Low ratings can result in wasted fuel, higher bills, and less comfort.

Spending more initially on a high AFUE furnace can be a great investment. If you live in an area with cold winters, you’ll use it a lot and save on heating costs while enjoying better temperature control.

Plus, with a high-efficiency furnace, you’re helping the environment by reducing greenhouse gas emissions. This benefits future generations and reduces your carbon footprint.

Pro Tip: Along with regular maintenance, change or clean air filters monthly to ensure maximum airflow through your furnace and improve energy efficiency.

Difference between high and low-efficiency furnaces

Furnaces are used worldwide in households, and their efficiency is much talked about. Grasping the difference between high and low-efficiency furnaces can be tough, if you don’t know the technical stuff. Let’s break it down.

High-Efficiency Furnace:

  • AFUE (Average Annual Fuel Utilisation Efficiency) 90-98%
  • Close coupled vent systems or direct venting
  • Cost-effective

Low-Efficiency Furnace:

  • AFUE up to 65%
  • B-Venting leads to heat loss
  • Not cost-effective

High-efficiency furnaces are energy-efficient and save on utility costs in the long run. They provide an AFUE rating with direct-venting combustion gases, reducing emissions and conserving energy.

I remember my mum complaining about sky-high heating bills in the early ’80s, when there were no high-efficiency furnaces. After upgrading our home furnace, I noticed a huge improvement in performance and costs. It made me realize how important it is to have an eco-friendly system that works best for us.

No heating? Time to cosy up with a hot cup of cocoa and a nice warm blanket!

Signs of Decreased Furnace Efficiency

To keep your heating system running smoothly, you need to stay on top of furnace maintenance. In this section, we’ll discuss some signs that your furnace needs repairs, including common issues that lead to decreased efficiency. We’ll also touch on the importance of regular maintenance and inspections to keep your furnace in top shape. Keep an eye out for warning signs of a failing furnace, and stay up to date on furnace maintenance to ensure your home stays warm and comfortable during cold winter months.

Warning signs of a failing furnace

If you’ve noticed something isn’t quite right with the temperature in your house, it could be a sign your furnace is malfunctioning. This can lead to discomfort and expensive bills. Here are 4 warnings:

  • Strange noises coming from your furnace
  • Air quality has dropped
  • Uneven temperatures across the house
  • Frequent repairs needed

It’s essential to act quickly when these signs appear. This helps keep you comfortable, safe, and can extend the life of your furnace.

I heard a story about someone who ignored odd sounds for months before replacing the furnace. This cost more than necessary. Don’t make the same mistake – act fast to get the best performance from your heating system.

Good news: your heating bill isn’t the only thing decreasing. Bad news: your furnace efficiency is going down.

Common issues that lead to decreased efficiency

Decreased furnace efficiency is a common problem faced by homeowners. It can be caused by various factors that need to be addressed ASAP to prevent further damage and costly repairs. Here are the most frequent culprits:

  • Clogged Filters: Dirty and clogged filters restrict airflow, making it tough for the furnace to work efficiently.
  • Ignition Issues: Malfunctioning ignition system or sensor can cause the furnace to have trouble igniting or staying lit.
  • Thermostat Malfunction: An unreliable thermostat can result in erratic heating and lower performance.
  • Poor Maintenance: Skipping regular upkeep of your furnace can lead to decreased performance and shorter lifespan.

If you notice any signs of decreased efficiency, don’t wait and call an expert in furnace repair. Taking quick action can save you both money and hassle. Don’t let the fear of expense stop you from getting necessary repairs done – it’s like playing Russian roulette with your heating bill!

Importance of regular maintenance and inspections

Maintenance and inspection of your furnace are essential. Not caring for it can result in poor performance and discomfort. It can even cause safety hazards, such as carbon monoxide leaks.

A professional technician can spot signs of wear, corrosion, or other issues. This includes the air filter, blower motor, heat exchanger, thermostat, and ductwork. Catching these problems early on can save you from greater damage later.

Regular inspections and tune-ups can also lengthen your furnace’s life. This means more savings on repairs and replacements. Plus, it helps to conserve energy in an eco-friendly home.

The EPA states that 46% of residential electricity is used for heating and cooling. Save money by doing regular maintenance on your furnace! No more vintage heating and high bills.

Replacing an Old Furnace

When it comes to replacing an old furnace, you have a few things to keep in mind. To make sure you’re making the right decision with a new furnace, it’s important to consider factors like heating load, age of the current furnace, and energy costs. Once you’ve decided to replace, you’ll need to choose the right new furnace and financing option for you. In this section, we’ll discuss the factors to consider before replacing a furnace, how to choose a new furnace, and the different financing options available to make this investment more manageable for your budget.

Factors to consider before replacing a furnace

Replacing an old furnace can be quite intimidating. Consider your options carefully before investing in a new one. Here are some factors to take into account:

  1. Age: If it’s more than 15 years, it may not be efficient anymore.
  2. Efficiency Rating: A higher-efficiency furnace will save money in the long run.
  3. Size: Based on home square footage.
  4. Ductwork: Check its condition. Repair or replace them before installing a new system.
  5. Fuel Type: Options vary depending on where you live.
  6. Budget: Set a budget before beginning the process.

Furthermore, don’t forget regular maintenance sessions. Each suggestion is important – consider age, efficiency rating, ducts, fuel type and set a budget! When selecting a new furnace, think of it as picking a spouse – reliable, efficient, and cost-effective!

Choosing a new furnace

Type of FurnaceGas, Electric, Oil
Efficiency Rating% Annual Fuel Utilisation Efficiency (AFUE)
System SizeBTU output capacity based on square footage of home or building
Brand ReputationConsumer Reports ratings and reviews of top brands

Take climate into account! Harsh winter climates might need more powerful and efficient systems. Don’t let FOMO control your choice. Consider all factors before investing or committing. Financing a furnace replacement is like asking your parents for money to buy a toy.

Financing options for furnace replacement

Replacing an old furnace can be tough, but with the right resources and options, it doesn’t have to be. Home Equity Loans, Personal Loans, Credit Cards, and Manufacturer Financing are all available. Plus, some states and utility companies offer rebates or low-interest loans for energy-efficient furnace replacements. It’s essential to weigh the pros and cons of every option before deciding. Talk to multiple lenders and manufacturers to get the best deal. According to, replacing an old furnace with an energy-efficient model can save up to 20 percent on heating costs annually – like getting rid of a dysfunctional ex!


Efficient furnaces are a must-have for a warm and comfortable home. Natural gas and electric furnaces are preferred for their cost-saving efficiency. Old furnaces need maintenance to prevent energy loss and carbon monoxide leaks. Warning signs to look out for are: frequent repairs, loud noises, cold rooms, and dry skin.

Replacing an old furnace can be pricey, but there are financing and protection plans available. A recent service call showed the importance of having a qualified technician. Unsecured ductwork or motor failure can cost a lot if not addressed. An energy-efficient furnace not only saves money but also helps reduce carbon dioxide emissions. It’s a great investment in your home-owning journey!