A Lennox garage heater can cost about $1,200-$6,500 installed, depending on the heating system, garage size, fuel, venting, and electrical or gas-line work. Lennox equipment availability and model names vary by dealer, so buyers should confirm the exact model and whether the quote covers a garage-rated heater rather than a standard home furnace.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Equipment | $700 | $1,600 | $3,000 | Heater, before installation |
| Installed gas heater | $1,500 | $3,400 | $6,500 | Includes typical labor and basic venting |
| Installed electric heater | $600 | $1,400 | $3,000 | May need a new circuit or panel work |
| Gas heater rate | $20 | $35 | $60 | Approximate equipment cost per 1,000 BTU/h |
| Installation labor | $500 | $1,200 | $2,400 | More for difficult venting or utility extensions |
What a Lennox garage heater costs for a typical garage
For a two-car garage of roughly 400-600 square feet, a professionally installed gas unit heater commonly lands around $2,000-$4,500. A straightforward replacement with existing gas, power, and venting can be near the lower end; new utility runs or a longer vent route can push the total above $5,000. A larger or poorly insulated garage may require more heating capacity and cost more.
Use $3,400 as a planning midpoint for a standard gas installation, not as a guaranteed Lennox retail price. The total assumes a basic ceiling-mounted heater, ordinary access, standard venting, and no major electrical-panel or gas-meter upgrade. Dealer quotes may include a Lennox-branded system, another compatible product, or a different heating arrangement, so the model number matters.
Electric garage heaters typically cost less to install when the circuit is already adequate, with common totals of $600-$1,800. They can be more expensive to operate than gas in areas with high electricity rates, especially for a garage used for many hours daily. A whole-home furnace extension or a separate ducted system may cost $3,000-$7,500 or more because it involves ductwork and controls, not simply a unit heater.
Assumptions: U.S. mid-market labor, standard-grade equipment, a 400-600-square-foot garage, and normal access. Regional prices and the exact Lennox model can change the estimate.
How heater, venting, and labor appear in the quote
Installation quotes should separate the heater from the work required to make it safe and usable. Compare equipment capacity and warranty along with the total; a low equipment price may not include a thermostat, vent kit, gas connection, permit, or startup testing.
| Quote item | Typical price | What changes the amount | Common unit rate |
|---|---|---|---|
| Heater equipment | $700-$3,000 | Capacity, efficiency, controls, and model | $20-$60 per 1,000 BTU/h |
| Labor and startup | $500-$1,600 | Mounting height, access, commissioning | $75-$150 per hour |
| Venting and fittings | $200-$900 | Vent length, roof or wall exit, materials | $15-$45 per vent-foot |
| Gas and electrical work | $250-$1,500 | Line distance, circuit capacity, shutoff needs | $10-$35 per gas-line foot |
| Permit and inspection | $75-$500 | City requirements and scope of work | $75-$500 per permit |
| Removal and disposal | $100-$400 | Old equipment size and disposal rules | $100-$400 per heater |
These ranges are separate quote components and should not be added at their maximums to predict every job. Some contractors bundle vent materials, startup, and disposal into a single installed price. Ask whether the quoted total includes sales tax, thermostat, condensate handling where applicable, and inspection fees.
The installed price is driven as much by utility connections and venting as by the heater itself. A basic 5-8-hour installation at $75-$150 per hour implies $375-$1,200 in labor before specialty work or minimum service charges.
BTU capacity, ceiling height, and fuel line distance change the price
Heating capacity is a major specification. A well-insulated 400-square-foot garage may need roughly 20,000-30,000 BTU/h, while a 600-800-square-foot space with drafts or a cold climate may call for 40,000-60,000 BTU/h. These are screening estimates, not a substitute for a heat-loss calculation; insulation, air leakage, desired temperature, and door use can shift the required output substantially.
A heater in the 20,000-30,000 BTU/h range may cost $700-$1,500 for equipment, while a 40,000-60,000 BTU/h unit may run $1,100-$2,600. Higher output can require larger gas piping, a different vent configuration, or added clearance planning. A contractor should confirm that the garage heater is rated for the location and that its installation follows the manufacturer’s clearances.
Ceiling height and mounting access also affect labor. A standard 8-10-foot ceiling is generally simpler than a 14-foot ceiling that needs lifts or extra mounting hardware; difficult access can add $150-$600. A gas line more than 25-30 feet from the heater may add $300-$1,000 or more, depending on pipe size, route, and local code. Long or complex vent routes can add another $200-$900.
Capacity should match the garage’s heat loss, not just its floor area. Oversizing can increase upfront equipment costs and cause uneven heating or short cycling, while undersizing may leave the space cold in severe weather. Insulation upgrades and sealing air leaks can sometimes reduce the required heater size, but they should be assessed before selecting equipment.
What installers charge for mounting, connections, and testing
A simple replacement can take about 4-6 labor hours when the new heater fits the existing location and the vent, gas, and electrical connections are usable. A new installation commonly takes 6-10 hours, and a project with long utility runs, roof work, or structural adjustments may require 1-2 days or multiple trades.
Typical HVAC labor rates fall around $75-$150 per hour, with higher service rates in expensive metro markets or for urgent work. Some companies price the job as a flat installation package rather than billing hourly. A quote should identify mounting, gas leak testing, electrical connection, vent inspection, thermostat setup, and operational testing.
Request the expected work hours and included startup checks before comparing labor totals. A low flat bid may exclude a permit, electrician, new shutoff valve, or vent penetration. Conversely, a higher quote may include coordinated trades and inspection handling. Ask whether the crew will return if an inspection identifies a correction.
Three garage layouts show how installed totals differ
These examples illustrate common scopes, not fixed Lennox dealer offers. The equipment line can vary by model and availability, and an installer should verify sizing and venting before issuing a firm quote.
| Garage and scope | Equipment | Labor and other work | Estimated total |
|---|---|---|---|
| 400 sq ft, existing gas and vent; 25,000 BTU/h replacement | $800-$1,400 | 5-6 hours; $500-$900 labor, $150-$350 startup materials | $1,450-$2,650 |
| 600 sq ft, new 45,000 BTU/h gas heater; 20-ft gas extension | $1,200-$2,300 | 8-10 hours; $800-$1,500 labor, $400-$900 line and vent work | $2,500-$5,000 |
| 500 sq ft, 7.5-kW electric heater; new 240-V circuit | $250-$800 | 4-8 hours; $400-$1,200 electrical and mounting work | $750-$2,300 |
The existing connections determine whether a small garage stays near the low end. The first example assumes the replacement does not require code corrections or a new vent. The second includes more extensive gas and vent work. The electric example excludes major panel replacement, which can add $1,000-$3,500 or more if the service is inadequate.
Gas, electric, and ducted Lennox options are not priced alike
A suspended gas unit heater directs heat into the garage without adding ducts to the house. It is often a practical choice when natural gas is available and the garage needs quick recovery after the door opens. Installed pricing is commonly $1,500-$6,500, with capacity, venting, and gas-line work explaining most of the range.
Electric resistance heating can cost $600-$3,000 installed, but operating expense depends on local utility rates and hours of use. A 7.5-kW heater operating for 4 hours uses about 30 kWh; at $0.15 per kWh, that is approximately $4.50 for that period before taxes and delivery charges. Actual consumption varies as the thermostat cycles the heater.
Connecting a garage to a home’s existing Lennox furnace may appear cheaper if unused capacity and nearby ductwork are available, but it can require added duct runs, balancing, and controls. A duct extension can cost roughly $500-$2,000, while a dedicated ducted system may total $3,000-$7,500. A standard residential furnace should not simply be installed in a garage; equipment location, combustion air, vehicle exposure, and code rules must be addressed.
Compare the full installed and operating cost, not just the heater’s purchase price. A gas model can have higher installation costs but lower seasonal energy expense in some areas. An electrician or HVAC contractor can verify electrical capacity, fuel availability, and whether the proposed equipment is approved for the garage environment.
Regional labor and permit rules shift the final estimate
Labor and permit costs vary by location. Quotes in high-cost urban markets in the Northeast, West Coast, and parts of Hawaii can be about 15%-35% above a national mid-market estimate. Rural markets may be 5%-20% lower for labor, but travel charges or limited contractor availability can offset that difference. These percentages are broad comparisons, not guaranteed local adjustments.
Cold-climate locations may need greater heater capacity, better insulation, or freeze-resistant installation details. Warmer regions can have lower heating loads but still require code-compliant venting and gas connections. Local fuel and electricity prices also change the long-term budget, so the lowest installed bid may not be the lowest-cost option over several winters.
Permits for gas appliances, electrical circuits, and vent penetrations commonly range from $75-$500, though some jurisdictions charge more or require separate inspections. Ask the contractor to identify permit responsibility and whether the work includes inspection corrections. Requirements differ by city and county, and an insurer or local building department may require documented, permitted work.
Use local permit and labor figures rather than applying a national average blindly. Confirm whether a quote includes the permit fee, inspection scheduling, and any required carbon-monoxide or combustion-safety checks. A contractor’s service area can also affect travel, minimum charges, and appointment timing.
Lower the Lennox heater price by controlling the installation scope
Keep the scope focused on the actual heating need. Improve door seals and insulation before buying a larger unit, and have the installer calculate the required capacity. If the existing gas line and vent are sound and code-compliant, a correctly sized replacement may avoid hundreds of dollars in new piping or vent materials.
Compare at least three written quotes using the same heater capacity, fuel type, vent route, thermostat, permit allowance, warranty, and startup tasks. Ask for the exact manufacturer and model number, equipment price, labor charge, and excluded work. If the quote says “Lennox” without a model or product description, request clarification about whether the heater itself is Lennox-branded or whether the contractor is supplying a different system through a Lennox dealer.
Schedule non-emergency work before the first cold snap when contractors have more scheduling flexibility. Avoid paying for upgrades that do not solve a documented need, such as unnecessary premium controls or an oversized heater. Do not skip required venting, clearances, permits, or electrical and gas safety work to reduce the bid.
The safest savings usually come from reducing avoidable labor and correcting the scope, not cutting safety requirements. If the existing heater needs only a thermostat, igniter, control board, or other repair, obtain a repair quote before replacing the entire unit. A repair may cost $150-$800, although a failed heat exchanger, obsolete parts, or repeated breakdowns can make replacement more economical.