Boiler Replacement Cost in Saint Louis, MO
Lennox 4-Ton 20 SEER

The average cost of boiler replacement in Saint Louis, MO with a Lennox 4.0-ton 20 SEER system is $8,350, with most homeowners paying between $7,960 and $8,740 depending on home conditions, permit fees, and labor availability. The Lennox 4.0-ton unit is a premium, energy-efficient unit engineered for long-term reliability, sized for homes with 1,600-2,100 sq ft of conditioned space. At 20 SEER, this unit qualifies for federal energy tax credits and delivers exceptional long-term savings.

Cost Breakdown - Saint Louis, MO

* Estimates based on Saint Louis area labor rates ($114.95-$186.58/hr, BLS-sourced). Actual costs vary by home conditions and contractor. Get 3 quotes.

About Boiler Replacement

Complete removal and replacement of a residential boiler used for hydronic (hot water or steam radiator) heating systems. In Saint Louis, MO, licensed HVAC contractors typically charge $115–$187 per hour for installation labor, with this job averaging 10 hours.

The equipment cost for the Lennox 4.0-ton 20 SEER system represents approximately $5,710 of your total. Installation labor in Saint Louis adds $1,510, with permit fees, refrigerant, and disposal bringing the full estimate to $8,350. Prices in MO vary by contractor — always collect 3 quotes before scheduling a major HVAC installation.

Signs You Need Boiler Replacement

Consider scheduling boiler replacement in Saint Louis, MO if you notice boiler over 15-20 years old or frequent pressure or leak issues or cold radiators or inconsistent heat. Early action prevents the costly emergency service premiums common in the Midwest region during peak seasons.

• -Boiler over 15-20 years old
• -Frequent pressure or leak issues
• -Cold radiators or inconsistent heat
• -Visible rust and corrosion on unit
• -Spiking gas bills

What's Included

• -Remove and haul away old boiler
• -Install new boiler unit
• -Connect to existing piping
• -Gas line reconnection
• -Expansion tank check or replacement
• -Pressure test, startup, and balancing

Hiring an HVAC Contractor in Saint Louis

• 1.Verify the contractor holds a current MO HVAC license and carries liability insurance.
• 2.Request an itemized quote that separates equipment, labor, and permit costs.
• 3.Ask specifically about Lennox dealer status — authorized dealers in Saint Louis, MO often offer extended warranties.
• 4.Confirm the quote includes refrigerant, line set, and startup commissioning — not just the equipment.
• 5.Check for manufacturer rebates and utility company incentives before signing.

Frequently Asked Questions