Furnace Installation
Heating Installation Services for Bellingham, WA, and all of Whatcom County
Smith Mechanical provides expert furnace installation for homes across Bellingham, Ferndale, Lynden, Blaine, and all of Whatcom County. From high-efficiency gas furnaces to complete heating system replacements, our licensed HVAC installers size, install, and test every unit for safe, efficient operation.
Up to 96% AFUE high-efficiency furnaces
Financing available
Get in touch today!
Years serving Whatcom, Skagit, and Island Counties
Emergency Service when YOU need it most
Homes and Businesses in Whatcom county served
INSTALLATION
Furnace Installation Done Right
A proper furnace installation starts with a thorough assessment. Smith Mechanical evaluates your home to ensure the right fit, efficiency, and comfort.
Proper Sizing & Load Calculation
We assess your home's heat loss to determine the correct furnace size — preventing efficiency problems from an oversized or undersized unit.
High-Efficiency Options
We help you choose the right AFUE rating for your budget. Newer models reach up to 95% AFUE, saving significant energy and money on heating costs.
Ductwork Inspection
We inspect your ducts for leaks, poor sealing, and improper sizing to ensure your new furnace delivers heat efficiently throughout your home.
Expert Installation & Testing
Our licensed technicians handle the full installation and run final tests to verify safe, efficient operation before leaving your home.

Furnace Installation
Smith Mechanical provides well-trained technicians and state-of-the-art equipment to install furnaces in residential homes.
Our technicians can inspect ductwork and other heating components and make recommendations to ensure you get the most out of your new furnace, and we treat our customers like family members to give you high-quality service.
At Smith Mechanical, we are passionate about our work and do our best to exceed the expectations of our customers. Whether you need to install a new furnace, our HVAC technicians can provide quick and safe services to meet your needs. We can answer your questions and determine the most beneficial and cost-effective course of action for your situation so your home stays warm and comfortable during the winter.
Furnace Services
Furnace Installations
Furnace Repairs and Maintenance
Furnace Sales
As green energy specialists, we can talk over your options and provide efficient and durable furnaces that can have lasting results for your home. Whether you need an entirely new high-efficiency gas furnace, our heating and HVAC technicians can determine the best brand and style to suite your needs.
While your old furnace may have a decent AFUE (Annual Fuel Utilization Efficiency) rating, the newer models can get up to 95% AFUE. This means that ninety-five percent of the fuel burned is actually converted to usable heat, which can save a lot of energy and money on heating costs. With our friendly and knowledgeable technicians who treat you like family, you can get quality assistance with your home furnace installation needs serving Whatcom, Skagit, North Snohomish County.
FAQ
Frequently Asked Questions - FAQ
How long does a furnace installation take?
Most furnace installations take 4–8 hours. The timeframe depends on the complexity of the job, whether ductwork modifications are needed, and the accessibility of your existing system. Our technicians will give you a more accurate estimate after assessing your home.
What size furnace do I need for my home?
Furnace sizing is based on a load calculation that accounts for your home's square footage, insulation levels, ceiling height, windows, and local climate. An oversized or undersized furnace causes efficiency problems and uneven comfort. Smith Mechanical performs a thorough assessment to recommend the right size for your specific home.
How much does a furnace installation cost?
Furnace installation costs vary based on the unit's efficiency rating, brand, size, and the complexity of the installation. Smith Mechanical offers free estimates so you know exactly what to expect before any work begins. We also offer financing options to help make the investment more manageable.
What AFUE rating should I look for in a new furnace?
AFUE (Annual Fuel Utilization Efficiency) measures how efficiently a furnace converts fuel to heat. Standard models start at 80% AFUE, while high-efficiency units reach up to 96–98%. Higher AFUE means lower energy bills over time. Our technicians can help you weigh the upfront cost against long-term savings to find the best option for your home and budget.
Do I need to replace my ductwork when installing a new furnace?
Not always. Our technicians inspect your existing ductwork during the assessment. If it's in good condition and properly sized, it can typically be reused. If there are significant leaks, improper sizing, or damage, we'll recommend repairs or replacement to ensure your new furnace performs at its best.
