Winters in Minnesota can be long and brutal, so it’s vital to have a reliable and efficient heating system. While any furnace will keep you warm, a high-efficiency furnace offers several significant advantages that can save you money and improve your comfort. Here’s why you should consider a high-efficiency furnace.

 

Features of a high-efficiency furnace 

AFUE Rating

The main measurement that determines whether or not a furnace is high-efficiency is its Annual Fuel Utilization Efficiency (AFUE) rating. This measures the percentage of fuel that a furnace converts into heat, acting like the miles-per-gallon (MPG) rating for your car.

AFUE is calculated by dividing the total heat output of a furnace by its total annual fuel consumption. AFUE ratings typically range from 80% to 98%. The higher the rating, the more efficient the furnace and the less fuel it consumes to produce the same amount of heat. To be considered high-efficiency, a furnace needs an AFUE rating of 90% or higher. 

Modulating burners 

Traditional burners operate at a single output level. When the furnace thermostat calls for heat, the burner turns on at full power and stays on until the desired temperature is reached. Then, it turns off completely until the temperature drops again. This constant cycling can be inefficient and lead to temperature fluctuations.

Modulating burners, on the other hand, operate on a continuously variable basis. This means they can adjust their output to precisely match the heating demand, eliminating the wasteful on-off cycling that plagues older models.

This precise control is achieved through a sophisticated system that monitors the temperature of your home and adjusts the fuel flow accordingly. The burner can operate anywhere between its minimum and maximum output, ensuring that the desired temperature is maintained consistently.

Variable speed blower motors

Single-speed blower motors operate at a constant high speed, circulating air at full capacity regardless of the heating demand. This can produce inefficient airflow, resulting in some spots being colder than desired while others are warmer than desired, as well as excessive wear on the motor itself. 

Variable speed motors can adjust their speed based on the heating demand. These efficient motors are equipped with electronic control systems that monitor the temperature and adjust the speed accordingly. This allows them to maintain a more consistent temperature throughout your home by delivering the right amount of air at the right time. 

Secondary heat exchanger

Traditional furnaces typically vent hot exhaust gasses, which are effectively unused heat, directly to the outside. This is an inefficient use of heat generated by the furnace. 

However, high-efficiency furnaces employ a secondary heat exchanger designed to extract this additional heat. 

As the heating fuel burns in the primary heat exchanger, it generates heat that warms the air passing through it. The hot exhaust gasses are then directed to the secondary heat exchanger, which is designed to be significantly cooler than the primary heat exchanger. This temperature difference initiates the condensation of water vapor within the exhaust gasses, releasing latent heat in the process. This heat is transferred back to the air circulating through the furnace, further increasing the overall efficiency of the heating process.

It’s important to note that condensing furnaces may require specific venting and drainage configurations compared to traditional models. Consult with a qualified HVAC professional to determine if a condensing furnace is the right choice for your home and ensure it is installed and maintained correctly for optimal performance.

Sealed combustion 

In high-efficiency furnaces, sealed combustion refers to a technology that isolates the combustion process from the indoor air of your home. 

Unlike traditional furnaces that draw air from inside your home for combustion, a sealed combustion furnace has a completely sealed chamber, so it can draw in air for combustion from outside the home and vent the exhaust gasses directly outside, preventing any interaction with the air you breathe. 

This contributes to your furnace’s overall efficiency because it does not lose heat through the flue when drawing air from inside the home. The sealed chamber also allows for more precise control of the combustion process, further optimizing efficiency. 

Beyond improving efficiency, sealing the combustion chamber prevents exhaust gasses from entering your home, significantly improving indoor air quality. This is particularly important for people with allergies, respiratory problems, or those who are sensitive to air pollutants. 

Additional energy-saving features

Smart thermostats. Pairing your high-efficiency furnace with a smart thermostat can significantly enhance its energy-saving capabilities. These advanced thermostats allow for programmable schedules, remote control, and geofencing features, optimizing heating to your specific needs and minimizing unnecessary energy consumption.

Zoned heating systems. A zoned heating system divides your home into multiple sections based on factors like layout, size, and insulation. Each zone has its own thermostat, allowing you to set different temperatures based on each area’s specific heating needs. This improves energy efficiency by minimizing the amount of heated air wasted in areas that don’t need it. 

Furnace humidifiers.  Dry air absorbs heat readily, making it feel colder than it actually is. Installing a furnace humidifier adds moisture to your home’s air, meaning the same temperature feels warmer. This allows you to lower your thermostat setting while maintaining a comfortable level of warmth.

Benefits of of a high-efficiency furnace 

Upgrading to a high-efficiency furnace offers a wide range of benefits that extend beyond simply heating your home. 

Comfort benefits

More consistent temperature. High-efficiency furnaces provide more consistent and even heating throughout your home, eliminating hot and cold spots. This ensures greater comfort for you and your family.

Improved air quality. Many high-efficiency furnaces come equipped with advanced air filtration systems that remove dust, allergens, and other pollutants from your indoor air. This can significantly improve air quality and reduce allergy and respiratory problems.

Quieter operation. Modern high-efficiency furnaces are designed to operate at lower noise levels, providing a quieter and more peaceful living environment.

Financial benefits

Lower energy bills. High-efficiency furnaces convert more fuel into heat, meaning you use less fuel to achieve the same level of comfort. This translates to significant savings on your heating bills, often exceeding 30% compared to older models.

Increased home value. A high-efficiency furnace is considered a valuable upgrade by potential buyers, potentially increasing the resale value of your home.

Tax credits and rebates. Depending on where you live, you may be eligible for tax credits and rebates for installing high-efficiency heating systems, further reducing the upfront cost.

Environmental benefits

Reduced greenhouse gas emissions. High-efficiency furnaces burn less fuel, leading to lower emissions and a smaller carbon footprint. This contributes to a cleaner environment and combats climate change.

Reduced air pollution. Improved combustion efficiency minimizes the release of harmful pollutants into the atmosphere, contributing to better air quality for everyone.

Sustainable Energy Use. By using less energy, you contribute to a more sustainable energy future and reduce reliance on limited resources.

Welter can help you upgrade to a high-efficiency furnace 

If it’s time for a new furnace, consider upgrading to a high-efficiency model. Welter installs and services high-efficiency furnaces and our professional HVAC technicians can help you decide if a high-efficiency model is the right for your home. Contact us today to get started.