For homes in Madison, WI, changing your furnace filter every 1–3 months during the winter is recommended. Factors like pet dander, indoor air quality, and furnace usage affect this timing. A clean filter promotes better airflow, keeps your system efficient, and helps maintain a healthier home environment—especially during Wisconsin’s long, cold winters.

When temperatures drop below zero in Dane County, keep your thermostat set to at least 68°F. This prevents your furnace from overworking and helps protect your home from issues like frozen pipes or uneven heating.

Yes. During extreme Wisconsin cold snaps, your furnace should run continuously to maintain consistent indoor temperatures and avoid freezing pipes. Don’t shut it off completely. If your home isn’t staying warm, call your local HVAC pros—like Pharo Heating & Cooling—for a system check.

Absolutely. A high-efficiency condensing gas furnace is ideal for Madison’s cold winters. These systems extract more heat with less energy use and are better insulated to handle cold outdoor temperatures. There are several gas furnace types available, including standard and condensing gas furnaces, each with advantages depending on your home’s size and insulation. Pharo Heating & Cooling can help you choose the best model for your comfort and energy goals. Pharo can also help you select the best natural gas furnace to match your home’s layout and energy-efficiency needs.

If your furnace goes out, stay calm. Use space heaters (safely), layer up, and close off unused rooms to retain heat. Heated blankets and electric fireplaces can also help temporarily. Then, call a local emergency HVAC technician in Madison—like Pharo Heating & Cooling, available 24/7.

There’s no hard temperature limit, but furnaces can struggle if they’re undersized, outdated, or poorly maintained. Madison homes with proper insulation and a well-maintained heating system should remain comfortable even when the temperature drops well below zero.

If your system runs constantly and still can’t maintain your desired temperature, it may be due to:

• A furnace that’s too small for your home
• Dirty filters restricting airflow
• Leaky ductwork or poor insulation

Pharo Heating & Cooling can perform a heating system inspection in Madison to pinpoint the issue and restore comfort. In some cases, an aging or undersized system may mean it’s time to consider a furnace replacement service to restore consistent warmth.

It’s common for furnaces in Madison to run frequently in extreme cold. However, constant, nonstop operation could signal a problem—like an aging furnace, blocked filter, or inefficient insulation. If you notice higher energy bills or uneven heating, get it checked by a professional.

Cold weather can lead to short cycling, especially if airflow is restricted by clogged filters or blocked vents. If your furnace turns on and off frequently, it’s time to call a technician. Short cycling reduces efficiency and increases wear on your system.

Most furnaces used in Madison-area homes are designed to work in subzero temperatures. However, system performance can suffer without regular maintenance or adequate insulation. To stay safe and warm, schedule seasonal service with a trusted local HVAC company.

Here are the most common reasons:

• Dirty filters
• Thermostat issues
• Poor insulation or ductwork problems
• A furnace that’s too old or underpowered

A winter tune-up from a Madison HVAC expert like Pharo Heating & Cooling can help optimize your system’s performance.

Not necessary. Furnaces are made to run continuously when needed. Turning yours off or drastically lowering the temperature can lead to problems—especially during subzero weather. Let your system maintain a steady temperature for both comfort and efficiency.

Yes. If your home relies on a water boiler for heating, annual water boiler maintenance is essential to ensure safe and efficient performance—especially during Wisconsin’s cold months. Pharo Heating & Cooling offers professional water boiler maintenance in Madison to keep your system running reliably all winter long.

A quality furnace replacement service includes a thorough evaluation of your current system, precise sizing of the new furnace, and expert installation to ensure optimal performance and energy efficiency. At Pharo Heating & Cooling, our certified technicians tailor solutions based on your home’s layout, insulation, and heating needs, ensuring your new furnace is the perfect fit for Wisconsin’s climate.

If your furnace is over 15–20 years old, requires frequent repairs, or struggles to keep your Madison home warm, it may be time to look into a professional furnace replacement service. Newer systems, like high-efficiency condensing gas furnaces, offer better performance, lower energy bills, and more reliable heating during Wisconsin’s harsh winters. Pharo Heating & Cooling can help you determine whether it’s time for a replacement or if a repair will suffice.

The U.S. Department of Energy suggests keeping your thermostat between 60–67°F overnight. Lowering the temperature slightly can help reduce energy costs while still keeping your Madison home cozy and safe.

Run time varies depending on home size, outdoor temperature, and insulation. In freezing conditions, it’s normal for your furnace to run longer. As long as it cycles off occasionally and your home stays warm, it’s working properly.

To prevent freezing pipes and keep your home safe, don’t set your thermostat below 55°F. Whether you’re traveling or simply asleep, we recommend keeping it between 60–68°F during the Madison winter months.

Signs of short cycling include:

• The system turns on and off every few minutes
• Uneven temperatures throughout the house
• Higher-than-usual energy bills

Have a technician test your thermostat and inspect your HVAC system if you notice these symptoms.