Heat Pump vs. Gas Furnace in Lenoir City & Farragut: Which Fits Your Home?

For most homes in Lenoir City, Farragut and the surrounding area, a cold-climate heat pump is the better replacement. It heats and cools with one system, handles East Tennessee winters, and qualifies for a TVA rebate that a gas furnace doesn’t. A gas furnace still makes sense when you have low-cost natural gas at the meter, live in one of the colder parts of our area, or have an air conditioner too new to replace. Here’s how cold it gets here, how the options compare, what each costs installed, and what TVA pays back.

Key Takeaways

• Heating systems in Loudon County are designed for 18°F and in Knox County for 20°F. Cold-climate heat pumps are rated to hold full capacity down to 5°F.
• A furnace-only replacement typically runs about $4,500 installed at Eco Home Solutions. A full system runs $7,900 to $18,600, depending on the warranty tier and the scope of the job.
• TVA EnergyRight pays $500 to $800 on a qualifying heat pump and nothing on a gas furnace. The federal 25C tax credit ended December 31, 2025.
• Dual fuel switches from the heat pump to the furnace at an adjustable balance point, which Carrier puts at 35°F to 40°F in a typical setup.

How cold does it get in Lenoir City and Farragut?

Loudon County’s 99% winter design temperature is 18°F, and Knox County’s is 20°F. That’s the outdoor temperature a heating system has to handle in all but the coldest 1% of hours in a typical year, and it’s the number a technician should use when they run a load calculation for your home. The figures below come from the ENERGY STAR Design Temperature Limit Reference Guide (2019 Edition), the reference used for ENERGY STAR certified HVAC design.

County	Nearby towns	99% winter design temp
Loudon	Lenoir City, Loudon, Greenback, Philadelphia	18°F
Knox	Farragut, Knoxville	20°F
Blount	Maryville, Alcoa	19°F
Monroe	Sweetwater, Madisonville	18°F
Roane	Kingston, Harriman	14°F
Sequatchie	Dunlap	22°F
Fentress	Jamestown	14°F
Cumberland	Crossville	14°F

Cold-climate heat pumps are built for these conditions. Mitsubishi rates its Hyper-Heating wall-mounted units to perform at 100% of rated capacity down to 5°F, with continued operation to -22°F. A standard heat pump gives up more capacity as the temperature falls, so when you compare quotes, ask whether each model is a cold-climate unit. On the few nights colder than your design temperature, the system’s backup heat covers the gap.

How do a heat pump, gas furnace and dual fuel compare?

A heat pump runs on electricity and handles both heating and cooling in one system. A gas furnace burns natural gas or propane, heats only, and works alongside a separate air conditioner. Dual fuel installs a heat pump and a furnace together and switches between them automatically. For most homes in Lenoir City and Farragut, the real choice is between the first two.

	Heat pump	Gas furnace	Dual fuel
Heats and cools	Both, one system	Heat only, needs a separate AC	Both
Fuel	Electricity	Natural gas or propane	Both, switches automatically
Needs a gas line	No	Yes	Yes
Air temperature at the vent	About 90°F to 110°F	Around 150°F	Depends which one is running
TVA rebate	$500 to $800	None	$500 to $800
Installed cost at Eco	Full system, $7,900 to $18,600	About $4,500 furnace-only	Quoted as a full system
Best for	Most homes here, especially all-electric and propane	Homes with low-cost natural gas at the meter	Homes with a working furnace, or colder areas
Watch out for	Sizing and installation quality	You still need an air conditioner	The balance point setting

The vent temperatures come from building scientist Allison Bailes of Energy Vanguard. Heat pump air can feel cool against your hand, so the system makes up the difference by running longer, steadier cycles. Your rooms reach the same thermostat setting either way.

A furnace also covers only half of your comfort system. If your air conditioner is the same age as your furnace, replacing the furnace alone usually means buying a new AC within a few years. A heat pump replaces both at once.

When is a gas furnace the better choice?

A gas furnace, or keeping the one you have, makes more sense in a few situations:

• Natural gas is already at your meter and your rates are low. A high-efficiency furnace can run close to a heat pump’s cost in that case. A year of gas and electric bills is the best way to compare.
• You live in one of the colder parts of our area. Roane, Fentress and Cumberland counties are designed for 14°F instead of 18°F to 20°F. A cold-climate heat pump still covers that, but dual fuel is worth pricing.
• Your air conditioner is only a few years old and the furnace failed. A furnace-only replacement is usually the sensible move.

When is a heat pump the clear choice?

A heat pump is the clear choice when there’s no natural gas line, when you heat with propane or electric resistance heat, or when your furnace and air conditioner are both near the end of their lives. Without a gas line, a heat pump works on the electric service you already have. With propane or electric baseboard or strip heat, you’re paying for fuel or electricity that turns into heat one for one at best, while a heat pump moves heat from the outdoor air and delivers more heat than the electricity it uses. TVA notes that heating with a heat pump is “much more energy efficient” than systems that depend on a fuel source. And when both systems are aging, one heat pump replaces your air conditioner at the same time.

How does a dual-fuel system decide when to switch?

A dual-fuel system pairs a heat pump with a gas furnace and switches between them at a setting called the balance point. Above it, the heat pump heats the house. Below it, the furnace takes over. Carrier says a typical dual fuel system switches between 35°F and 40°F, and that your technician can adjust the point based on your local climate and energy rates. A cold-climate heat pump can keep heating well below that range, so the right setting depends on your equipment and on what you pay for gas and electricity.

Dual fuel is a good fit if you have a working gas furnace and need to replace your air conditioner, or if your home is in one of the colder parts of our area. When you get a dual-fuel quote, ask what balance point the installer plans to set and why.

What does a heat pump or furnace cost in Lenoir City and Farragut?

A furnace-only replacement typically runs about $4,500 installed at Eco Home Solutions, and a full heating and cooling system runs $7,900 to $18,600. The system prices on our pricing page come in three tiers. The step from one tier to the next is the length of the labor warranty and the included maintenance. The range inside each tier comes from the job itself: a direct swap or one that needs modifications, fuel type, upgrades and add-ons. That’s why two quotes on the same house can differ by thousands.

Package	Installed price	What it covers
Furnace only	About $4,500	Gas furnace swap; existing ductwork and air conditioner stay
Essential	$7,900 to $11,500	10-year parts, 1-year labor
Eco-Platinum	$9,700 to $14,600	10-year parts, 5-year labor, 5-year maintenance
Eco-Platinum Plus	$14,800 to $18,600	10-year parts, 10-year labor, 10-year maintenance

Ductwork is priced separately. Full duct replacement runs $6,100 to $12,000 and duct sealing runs $500 to $1,700, so it helps to know which one your house needs before you compare quotes.

What rebates are available in 2026?

TVA EnergyRight pays $500 to $800 on a qualifying heat pump and has no rebate for a gas furnace. The federal 25C tax credit no longer applies: the IRS says it covers improvements made through December 31, 2025, so a 2026 installation doesn’t qualify. These are TVA’s current heat pump rebates:

Upgrade	TVA rebate
Heat pump, air source or dual fuel, 17 SEER2 or higher	$800
Heat pump, air source or dual fuel, 15 to 16.99 SEER2	$500
Ductless mini split, 17 SEER2 or higher	$800
Duct sealing, repair, insulation or replacement	$300

The duct rebate requires the complete duct system to be brought to TVA standards. TVA also requires every rebate-eligible upgrade to be completed by a member of its Quality Contractor Network, and that contractor submits the rebate for you. Eco Home Solutions is a Quality Contractor Network member through Lenoir City Utilities Board. If you’re comparing quotes, confirm each installer’s status before you count the rebate in your budget.

Should you repair or replace your current system?

Carrier says a well-maintained gas furnace should last 15 or more years, and that replacement is often the better choice once a repair approaches 50% of the cost of a new system or the unit is past 15 years. TVA puts the average HVAC system at 15 to 20 years with proper maintenance, and twice-yearly maintenance is what helps a system reach the top of that range. Eco’s repair or replace calculator uses the same 50% rule plus the $5,000 rule: multiply the system’s age by the repair cost, and a result over $5,000 points toward replacement. If you do repair, Eco’s 100% Repair Rebate credits the price of a qualifying repair toward a new system if you replace within 12 months.

A few signs are worth a technician’s look. On a heat pump, rising bills with no change in your habits often mean the system is leaning on its auxiliary heat strips, which is worth a diagnostic before it turns into a replacement. On a furnace, a cracked heat exchanger can leak carbon monoxide and shouldn’t be left running. If your furnace is blowing cold air or won’t start, a few checks can rule out the simple causes first.

New heat pumps and air conditioners built since 2025 use R-454B or R-32 refrigerant. Older R-410A equipment can still be installed under EPA’s 2026 rule, so if a quote replaces only part of a split system, ask which refrigerant each side uses.

Frequently Asked Questions

Which is cheaper to run, a heat pump or a gas furnace?

For most of our heating season, a heat pump. A gas furnace converts fuel to heat at less than 100% efficiency (its AFUE rating), while a heat pump moves heat from the outdoor air and delivers more heat than the electricity it uses. That advantage shrinks as temperatures drop, so a home with low natural gas rates and a high-efficiency furnace can come out close. Comparing a year of your gas and electric bills is the most reliable way to tell.

Why don’t some contractors like heat pumps?

Much of the doubt goes back to older single-stage heat pumps that struggled in cold weather, and to installations that went wrong: a system sized by square footage instead of a load calculation, a dual-fuel balance point left at the default, or leaky ducts that push the system onto its backup heat strips. Current cold-climate equipment, sized and installed correctly, handles East Tennessee winters.

How much does it cost to replace a furnace or put in a heat pump on a 2,000 square foot house?

At Eco Home Solutions, a furnace-only replacement typically runs about $4,500 installed, and a full system replacement runs $7,900 to $18,600. Beyond the size of the equipment, the warranty tier, the condition of your ductwork and whether the job is a direct swap or needs modifications all move the final number.

Are gas furnaces being phased out?

No. Gas furnaces are still made, sold and installed in Tennessee, and Eco still installs them. Federal efficiency standards tighten over time, which changes which furnace models are on the market, not whether you can heat with gas. The 2026 change most homeowners hear about is refrigerant, and that applies to heat pumps and air conditioners, not furnaces.

Ready to figure out which one fits your home?

If your system is getting older, we can assess your home and ductwork, walk you through heat pump, furnace and dual-fuel options with upfront pricing, and confirm what the TVA rebate looks like on the system you choose. Estimates are free. Call (844) 305-4822 or schedule online. Eco Home Solutions is a Carrier Certified Dealer with NATE-certified technicians, licensed in Tennessee (HVAC #81014, Plumbing #4812), and a real person answers the phone 24/7.