Graystone Comfort
Heating and Cooling Services in Deerfield, IL
Split-levels that are warm upstairs and cold in the family room. Ranches with ductwork older than the people living in them. Deerfield has a particular housing stock, and it comes with particular problems. We know them.
Graystone Comfort
Heating and Cooling Services in Deerfield, IL
Split-levels that are warm upstairs and cold in the family room. Ranches with ductwork older than the people living in them. Deerfield has a particular housing stock, and it comes with particular problems. We know them.
Much of Deerfield was built in a concentrated stretch after the war — ranches, split-levels, and colonials that went up through the 1950s and 60s. Those homes were designed around heating, with air conditioning added later if at all, and the ductwork reflects it. It's the reason so many Deerfield homeowners describe the same complaints to us: rooms that never balance, a lower level that stays cold, and a system that runs constantly without ever getting it right.
Those are solvable problems. They're just not solved by replacing the furnace with a bigger one.
Our Services
HVAC Installation, Maintenance & Repair in Deerfield
Heating & Furnace
Furnaces, boilers, and heating repairs throughout Deerfield. If your home still has its original ductwork, a furnace replacement is the right moment to find out whether that ductwork can actually support a modern system.
Air Conditioning
Repairs, replacements, and spring tune-ups. In homes where cooling was added after the fact, comfort problems are often about air distribution rather than capacity.
Water Heaters
Gas, electric, and tankless. Replacements in mid-century homes frequently turn up venting or clearance issues worth knowing about in advance.
Indoor Air Quality
Decades-old ductwork carries decades of dust. Filtration, humidity control, and duct cleaning or sealing where it's warranted.
Commercial HVAC
Deerfield has one of the larger office corridors on the North Shore. We service and install commercial systems for offices, professional buildings, and retail space.
Emergency Service
Breakdowns don't wait for business hours. Call us any time.
Learn more ->
Call us at 224-933-4305 today!
Heating and Cooling Services
What we see in Deerfield homes
Split-levels that won't balance
This is the signature Deerfield comfort complaint. A split-level puts three or four half-floors on one thermostat, and warm air does what warm air does — it collects at the top while the lower level stays cold. Most of the time the equipment is fine. The fix is in the distribution: adding or resizing returns on the lower level, adjusting dampers, sometimes zoning. A larger furnace makes it worse, not better, because it short-cycles and never moves enough air to mix the floors.
Ductwork built for heating only
Homes from the 1950s and 60s were designed around a furnace, with supply registers placed for heat and returns kept to a minimum. When central air arrived later, it was usually pushed through that same duct system. Cooling has different airflow requirements than heating, and undersized returns are the most common reason a Deerfield house has a room that simply never cools. It's worth measuring before assuming the AC is undersized.
Ducts in the slab
Some homes of this era run supply ducts through or beneath the concrete slab. When they work, they work well. When they don't — collapsed sections, groundwater intrusion, decades of debris — the repair options are limited and the honest conversation is about alternatives rather than restoration. If you have floor registers on a slab-on-grade home and persistent airflow problems, this is worth investigating rather than guessing a
Original equipment in second-generation houses
Plenty of Deerfield homes have changed hands once or twice while keeping mechanical systems that were installed a long time ago. If you bought a house here and don't know how old the furnace is, the label inside the front panel usually has a serial number that encodes the build date. Knowing it changes whether you're planning a replacement or reacting to one.
Teardowns and new construction
Deerfield has steady rebuild activity, and new construction is the one situation where system sizing gets decided from scratch. It's also where it most often goes wrong — a builder's default equipment selection without a proper load calculation of the actual house. If you're building or buying new, ask whether a Manual J was performed. It's a reasonable question and the answer tells you a lot.
Permits
The Village of Deerfield requires permits for HVAC equipment replacement, with inspection as part of the process. We pull the permit and handle the inspection as part of the job.
Call us at 224-933-4305 today!
Why Choose Graystone Comfort?
A Different Kind of HVAC Company
We're a family-run, woman-owned business, and one of the very few like it in Lake County. Every job gets the same attention, whether it's a furnace tune-up in Deerfield or a full system replacement in Lake Forest.
Our founder spent twenty years in the trades before starting this company — working her way from technician to operations manager at one of the Chicago area's largest HVAC firms. She knows what good work looks like, and what it takes to earn a neighbor's trust and keep it.
100% Satisfaction Guarantee
Fully Bonded and Insured
Decades of HVAC Experience
Graystone Comfort Reviews
Hear It From Our Customers
"I wish all contractors were this good!"
"Graystone is the most professional HVAC company I've ever worked with. They installed my Ecobee and replaced my humidifier. I couldn't recommend them more. I wish all contractors were this good!"
Greg A.
"I would recommend them to anyone."
"I have used Graystone Comfort for AC and heater maintenance. They are very professional and don’t mind answering your question, even a text away. I would recommend them to anyone."
Ariana V.
"They will be the only people we call from now on."
"We had air conditioner issues over the holiday weekend. Nichole was amazing came over and trouble shot what we needed and was able to fix it and give us a reasonable quote for a new air conditioner and furnace. They will be the only people we call from now on."
Lisa S.
Flexible Financing
Comfort now, payments over time
Get the system your home needs now, and pay over time. Prequalifying takes just a few minutes.
Our Service Area
Nearby HVAC Service Areas
Lake County is home base, and we take calls throughout Northern Illinois — Highland Park, Northbrook, Lake Forest, Buffalo Grove, and beyond.
If you're not sure whether we cover your area, just call. The answer is probably yes.
FAQ
Common Questions About Heating and Cooling Services
Why is my split-level air tempurature always uneven?
Usually air distribution rather than equipment. Split-levels stack half-floors on a single thermostat, and warm air collects at the top while the lower level stays cold. Adding or resizing return air on the lower level, adjusting dampers, or zoning the system typically solves it. A bigger furnace generally makes it worse.
My house has central air but one room never cools. Is the AC too small?
Often not. In homes where cooling was added to a heating-era duct system, the more common cause is insufficient return air or undersized ductwork to that room. Worth measuring before replacing equipment.
Do you offer emergency HVAC service in Deerfield?
24 hours a day, seven days a week. Call 224-933-4305.
Do I need a permit to replace my furnace in Deerfield?
Yes. The Village of Deerfield requires permits for HVAC equipment replacement, and we handle the permit and inspection as part of the installation.
How old is my furnace?
There's usually a manufacturer's label inside the front panel, and the first four digits of the serial number often encode the week and year it was built. If it's past fifteen years, replacement planning is a reasonable conversation.
Do you work on commercial buildings in Deerfield?
Yes — offices, professional buildings, and retail space, including rooftop units.
How often should I service my air conditioner?
Once a year, in the spring. More on why Northern Illinois is hard on cooling equipment: How Often Should You Service Your Air Conditioner in Northern Illinois?