Graystone Comfort
Furnace Installation & Replacement in Lake County, IL
In this climate, your furnace is the most important machine in your house — it’ll run more hours per year than your car. When it’s time to replace it, the install quality matters as much as the equipment. We size it right, install it carefully, and back it with our 100% satisfaction guarantee.
Graystone Comfort
Furnace Installation & Replacement in Lake County, IL
In this climate, your furnace is the most important machine in your house — it’ll run more hours per year than your car. When it’s time to replace it, the install quality matters as much as the equipment. We size it right, install it carefully, and back it with our 100% satisfaction guarantee.
Furnace Replacement
Is It Time to Replace Your Furnace?
System Age
At 15–20+ years, even a running furnace is inefficient by modern standards — and major failures become a “when,” not “if.”
Repeated repair bills
When a single repair approaches half the cost of replacement — or you’re calling us every winter — the math has spoken.
Cracked heat exchanger
This one isn’t optional. It’s a carbon monoxide risk and nearly always means replacement.
Uneven heating or constant cycling
Often a sign the furnace was never sized properly for your home.
Climbing gas bills
Modern high-efficiency furnaces convert 95%+ of fuel into heat. Many older units manage 80% or less — the rest goes up the flue.
Not sure your furnace is done? We’ll give you an honest assessment — including “it’s got a few good winters left” when that’s true.
Call us at 224-933-4305 today!
Our Process
Our Furnace Installation Process
Assessment and sizing
We measure your home — square footage, insulation, windows, ductwork — and run a proper heating load calculation.
Clear options, real prices
A few furnace options at different efficiency levels and price points, with the operating-cost tradeoffs explained honestly.
Professional installation
We remove the old unit, install the new one, and test the full system under load. Your home stays as clean as we found it.
Follow-through
We register your warranty and stay a phone call away. You’re a neighbor now, not a closed ticket.
High-Efficiency Furnace Options
A 95%+ AFUE furnace costs more upfront but pays some of that back every single month of a Northern Illinois heating season — heating dominates Lake County utility bills. We’ll show you the actual payback math for each option.
Flexible Financing
Comfort now, payments over time
A new furnace shouldn't have to wait for a windfall. Prequalifying takes just a few minutes — so you can get comfortable now and pay over time.
Our Service Area
Furnace Installation Throughout Lake County and Northern Illinois
Graystone Comfort installs and replaces furnaces across Lincolnshire, Libertyville, Gurnee, Vernon Hills, Grayslake, and Mundelein, plus North Shore communities like Highland Park, Deerfield, Lake Forest, and Buffalo Grove.
Lake County is home base, but we take installation projects throughout Northern Illinois — if you’re not sure whether we cover your area, just call. The answer is probably yes.
FAQ
Common Furnace Installation Questions
How much does a new furnace cost?
It varies with your home’s size, the efficiency level you choose, and the condition of your ductwork and venting. We provide free in-home quotes with real, complete numbers — no surprises on install day.
How long does furnace installation take?
Most replacements are done in a single day. Jobs involving venting changes or ductwork modifications may run longer, and we’ll tell you before we start.
What efficiency rating should I choose?
What efficiency rating should I choose?
For our climate, high-efficiency (95%+ AFUE) usually justifies itself over the furnace’s life. But the right answer depends on how long you’ll be in the home — we’ll walk you through it.
Can you replace my furnace and AC at the same time?
Yes — and if both are near end-of-life, doing them together often saves money and ensures the components are properly matched.
Can you replace my furnace and AC at the same time?
Yes — and if both are near end-of-life, replacing your air conditioner along with your furnace often saves money and ensures the components are properly matched.