Key Takeaways
- Must-Have Gas Furnace Accessories: For a proper, long-lasting installation, add the most common essentials: smart thermostat, thermostat wire, LP conversion kit, return ductwork & knock-down supply plenums, air filter rack, and drain pan.
- Airflow & Protection Extend System Life: Correct return/supply airflow boosts comfort and efficiency, filter racks improve indoor air quality while protecting components, and a secondary drain pan (ideally with a float switch) helps prevent water damage.
- Choose Accessories That Match Your Model: Verify compatibility by furnace model, plan for smart thermostat wiring (often a “C” wire), and use the manufacturer-approved LP conversion kit for propane. Matched accessories are listed on each furnace product page for easy add-to-cart.
Upgrading to a new gas furnace? Don’t forget the small parts that make a big difference. The right accessories ensure proper installation, compatibility, and long-term performance—so your system runs safely and efficiently from day one. Below is a guide to the most commonly purchased add-ons.
Comfort & Control Accessories for Your Gas Furnace
Smart Thermostats
Smart thermostats let you program schedules, fine-tune temperatures from your phone, and monitor energy use. The result: steady comfort and fewer wasted heating cycles—often lowering bills over the season.
Pro tip: Check that your chosen thermostat is compatible with your furnace model and wiring. Shop smart thermostats.
Thermostat Wire
Many smart thermostats need additional conductors (like a “C” wire). New thermostat wire is inexpensive, easy to run, and ensures clean communication between your furnace and thermostat—no more dropout errors or mystery short cycling.
Pro tip: If your existing wire bundle is old or limited to just a few conductors, upgrading now saves headaches later. Shop thermostat wires.
Liquid Propane (LP) Conversion Kits
If your home uses propane instead of natural gas, you’ll need the manufacturer-approved LP conversion kit. These kits include the correct orifices and regulator settings to safely adapt your furnace to liquid propane.
Pro tip: Always use the specific conversion kit recommended for your furnace model. Shop LP conversion kits.
Airflow & Protection Accessories That Extend System Life
Return Air Ductwork & Knock-Down Supply Plenums
Proper airflow is essential. Return ductwork pulls air back to the furnace, while the supply plenum distributes warm air throughout your home. Knock-down plenums ship flat, assemble quickly, and fit most installs.
Pro tip: Correct airflow improves comfort, reduces noise, and helps your furnace run within spec. Shop return and supply ductwork.
Air Filter Racks
Many furnaces don’t ship with a built-in filter slot. An external filter rack gives you easy access for replacements, protects your equipment from dust and debris, and improves indoor air quality.
Pro tip: Choose the rack size that matches the filter type (standard or media) you plan to use. Shop filter racks.
Drain Pans
Horizontal, attic, crawlspace, or basement installation? A secondary drain pan adds a layer of protection by catching condensate overflow or small leaks before they become big repairs.
Pro tip: Pair the pan with a float switch for added peace of mind. Shop drain pans.
How to Choose the Right Add-Ons
- Match by model: Use the accessories listed on your furnace product page to ensure a perfect fit.
- Plan for wiring: If you’re moving to a smart thermostat, budget for new thermostat wire.
- Think airflow: Proper return/supply sizing keeps your system quiet, efficient, and long-lasting.
- Protect the install: In moisture-prone or overhead locations, a drain pan is cheap insurance.
Shop Gas Furnace Accessories at HVACDirect.com
All of these accessories are conveniently listed right on each furnace product page—just add what you need with a few clicks. Get expert help, competitive pricing, and fast shipping at HVACDirect.com.
