Lennox air conditioner prices: what is published and what to compare

Lennox publishes system price ranges by home size. They apply when the home does not need new ductwork.

The Lennox guide does not break these ranges down by air conditioner, furnace or heat pump, and it does not list what is included. This Old House says to treat a brand average as a starting point, not a guaranteed price.

Lennox equipment is sold and installed through Lennox dealers. There is no public price list by model, so the number that matters is the written quote from a dealer who has seen your house.

Lennox names four things that shape the price:

• Size of your home and system capacity. More square feet means more tons of cooling and more BTU of heat.
• Installation complexity and labor. Lennox says homes that need new ductwork, electrical upgrades or structural modifications will incur higher labor costs.
• Brand, equipment quality and warranty. Lennox sells several product series at different price levels, including the Merit and Elite series and the Dave Lennox Signature Collection.
• Product features. Variable-speed compressors, higher SEER2 ratings and communicating controls cost more than single-stage equipment.

Installation makes up a large part of any quote. Labor, refrigerant lines, the pad, electrical work, permits and removal of old equipment are all in the installed price. The AC replacement cost guide explains how size, SEER2 and region move the price for any brand.

Lennox says eligible equipment must be registered within 60 days of installation in an existing home, or within 60 days of the closing date for new construction, to receive its Extended Limited Warranty at no additional charge. Without registration, eligible equipment has the default parts-only Basic Limited Warranty.

The standard extension is parts-only. Lennox also offers an alternative for registered equipment that includes 3 years of labor coverage in exchange for a different parts term. In California, Florida, Georgia for units installed on or after January 1, 2026, and Quebec, Lennox says eligible equipment automatically comes with the parts-only Extended Limited Warranty.

Ask the dealer who will register the equipment and which coverage option they are selecting, and keep the confirmation.

• Exact model numbers for the outdoor unit, the indoor coil or air handler, and the furnace. A brand name alone tells you very little.
• Size and efficiency. Tons or BTU, SEER2 for cooling, and whether the compressor is single-stage, two-stage or variable-speed.
• How the size was chosen. A load calculation for your house beats copying the old unit's size.
• Scope of installation. Refrigerant lines, pad, electrical, drain, duct changes, thermostat, permit and removal of the old equipment.
• Warranties. The manufacturer's parts term, who registers the equipment, and the installer's own labor warranty in writing.

Ask each dealer which Lennox series and model they are quoting. A quote for an entry series and a quote for the top series are different products, even at the same size. When two dealers quote the same model, the difference lies in installation scope, labor warranty and company overhead. More replacement prices are in the HVAC cost guides.