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Savings today. Comfort all year long.

Free furnace with an A/C purchase.*

For a limited-time only, when you buy a qualifying air conditioner from Thornton & Grooms you’ll get a brand-new furnace for free. 

And with flexible financing you can start enjoying year-round comfort right now, with a payment plan that works for your budget.

Schedule Your Free Quoteor call (248) 644-7810

Why upgrade with Thornton & Grooms?

  • Lennox® preferred dealer: When you buy from us, you’re not just getting a top-tier Lennox system; you’re also getting the peace of mind that it’s installed by a team Lennox trusts.
  • Warranties and rebates: Your purchase comes with a standard 10-year parts and 5‑year labor warranty. Any qualified rebates will be filled out for you.
  • Flexible financing: We offer various financing options to fit your budget.
  • We Care Guarantee: We back up our professionalism, reputation, and convenient services with our We Care Guarantee because we stand behind everything we do. We promise to deliver 5‑star service to our customers and our community every time.

Limited-time offerPurchase a new A/C and get a furnace free.

Offer Details

*Offer begins 2/1/26 and is subject to change at any time. Offer applies to purchase of Lennox® SLP99UHV furnace and Lennox SLK22KLV heat pump. Savings vary based on the Lennox system purchased. Home Care Club members save an additional 5% off installation. Offer is not applicable to previous purchases, and may not be combined with other offers.

Free Quote

Process :Your HVAC Install in 5 Easy Steps

  1. Schedule your Comfort Assessment

    You have two options when it comes to requesting an in-home Comfort Assessment with Thornton & Grooms. You can call us at (248) 644‑7810. Or you can reach out to us online.

  2. Choose your comfort system

    A Comfort Advisor will meet you at your home to discuss different HVAC units and share pricing options for each. Your Comfort Advisor will always give you at least three options to review, and we never press you to choose one over the other.

  3. Get special pricing and financing options

    After you’ve selected a system, our Comfort Advisor will review special pricing and rebates which are available for your unit. Before the Comfort Advisor leaves, they’ll hand you a fixed price quote for the entire project.

  4. Install your new system

    Most of our installations can be scheduled out on the same day or very soon after your Comfort Assessment. On the day of your installation, the team will text you to let you know they’re on their way. We’ll also process any system rebates you received at the office.

    Our post-installation process includes:

    • Clean all work spaces of debris
    • Share our post-installation checklist
    • Train you on how to care for your new system
Schedule your Free Quote

*Offer starts 7/27/26 and is subject to change at anytime. To qualify for the free furnace, customer must purchase a 13-seer or greater air conditioner. Offer does not include labor for furnace installation. This offer is only combinable with the standard 5% Home Care Club Membership discount. No other discounts or promotions can be applied. Not applicable on previous work