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Furnace installation is a major step in improving your home’s comfort, energy efficiency, and long-term heating reliability. Whether you are replacing an outdated unit or planning a brand-new furnace install, understanding the process ahead helps you avoid costly mistakes and unexpected delays.
Homeowners often ask how to install a furnace correctly, how long the installation takes, and what factors influence the overall timeline. In this guide, we break down each stage of the furnace installation process so you know exactly what to expect before, during, and after installation.
Furnace Size Calculation
A licensed technician will use a furnace size calculator to determine the right unit for your home. More technical calculations exist, but here’s a simpler way to do it. In calculating furnace size, you need two things:
- Your Home’s Square Footage
- The Climate Zone You Live In
It’s easy to calculate the square footage of your home. Just measure the length and width of each room and multiply the two; add up the numbers you get for each room to determine the total. The U.S. is divided up into five climate zones. The colder your climate zone, the more British Thermal Units (BTUs) you’ll need. So, if you live in the north, you’ll need a more powerful furnace than if you live farther south. Larger homes also need more BTUs.
Generally, you’ll need anywhere from 30 to 60 BTUs per square foot.2
What to Know When Buying a New Furnace
If you’re buying a new furnace, here are some things you need to know:
- Efficiency: Energy efficiency doesn’t equate to heating output, although a more efficient furnace will use less propane, gas, or electricity, depending on the type of unit. Most furnaces now have an Annual Fuel Utilization Efficiency (AFUE) rating of 78%, although units with an AFUE rating between 80% and 85% are not uncommon. On the high end is a 98% AFUE furnace.
- Fuel Type: Depending on the furnace, it can use natural gas, which is efficient and heats homes quickly. Propane provides the same advantages and you don’t need a gas line installed. Durable and quiet, electric furnaces are easy to install and cost-effective to maintain. However, high electricity prices can increase operating costs. For homeowners committed to green energy solutions, there are solar and geothermal furnaces.
- Single-Speed vs. Variable-Speed Blowers: Single-speed blowers run at full capacity when on, while variable-speed blowers can operate at different speeds. This allows control over airflow based on heating demand. It also helps balance humidity and temperature as well as improve air quality.
- Rebates: Rebates are often available for installing a high-efficiency furnace. Installing an energy-efficient system can also earn you a federal tax credit. Your local HVAC company should know whether your furnace is eligible for any type of incentive or rebate. These can save up to several hundred dollars on installation.
- Warranty: Most manufacturers include a 10-year limited parts warranty. Some offer even longer warranties for heat exchangers. Ask your Fremont furnace installation contractor about the details of the warranty before signing any furnace installation or service contract.
Furnace Installation Considerations
Before scheduling a furnace install, several important factors should be reviewed to ensure a smooth and successful installation.
Key furnace installation considerations include:
- Fuel type availability (gas or electric)
- Existing ductwork condition and layout
- Venting and combustion air requirements
- Electrical capacity and safety upgrades
- Local building codes and permit requirements
Addressing these considerations in advance helps reduce installation delays and ensures the furnace installation meets safety and efficiency standards.
A Look at the Furnace Installation Process
Homeowners often ask how to install a furnace and what actually happens during installation. While furnace installation should always be completed by licensed professionals, understanding the general process helps set realistic expectations.
A standard furnace installation process typically includes:
- Safely removing the old furnace and disconnecting utilities
- Inspecting ductwork and making airflow adjustments if needed
- Setting and securing the new furnace in place
- Connecting gas, electrical, and ventilation systems
- Testing the furnace for proper operation, airflow, and safety
Each stage of the furnace install is essential for reliable performance and long-term system durability.
Schedule Fremont Furnace Installation Today
At IRBIS, our technicians are extensively trained to install furnaces in Fremont, Menlo Park, Los Altos, Mountain View, Santa Clara, San Jose, and other locations in Northern California. We use a proven furnace installation process and handle every step, from consultation to helping choose and operate custom solutions. Our team obtains city permits, provides a detailed report on the installation, and tests and inspects your new system.
To schedule a consultation and learn more about the equipment we install, special offers, and financing, call (669) 312 3643.
