Heating.
Furnaces, boilers and heat pumps: repair, replacement and right-sized installs.
Heating · Cooling · Home Performance · Chicago Area
A Castle of Comfort,
Built to Last.
Castle Comfort designs, installs and maintains heating and cooling for homes and light-commercial buildings, starting with how your home actually works, not a rule of thumb.
Photo needed: David on a job site, or a finished install he is proud of (560 x 440).
Owner-operated. Every job is designed by David and led by him on site.
15+ years
Commercial & Residential HVAC
Owner-operated
David Leads Every Job
ACCA Manual J, S & D
Load, Equipment & Duct Design
★★★★★ 5.0
Google Reviews
Fully Insured
Proof of Insurance on Request
Services
Everything Your Home Needs.
Residential homes and light-commercial sites. From a single repair to a fully designed system.
- Learn more → about Heating
- Learn more → about Cooling
Cooling.
Air conditioning and heat pump cooling that manages humidity, not just temperature.
- Learn more → about Energy & Comfort Assessments
Energy & Comfort Assessments.
Find out how your home or building really performs, then choose what to do about it: repair, upgrade, replace, or nothing at all.
- Learn more → about System Design
System Design.
ACCA Manual J, S & D: room-by-room loads, equipment selection and duct design before anything is bought.
- Learn more → about New Construction
New Construction.
New homes and new commercial buildings: the system designed with the plans, installed on schedule and verified.
- Learn more → about Maintenance & Repair
Maintenance & Repair.
Service on existing equipment, any brand. Honest diagnosis first, repair second.
- Learn more → about Light Commercial
Light Commercial.
Small offices, retail and workshops, designed, installed and maintained by the same person.
- Learn more → about Castle Care Plan
Castle Care Plan.
A fixed yearly plan for the seasonal care of your existing system, so it is looked after before it needs help.
How It All Fits Together
From First Look to Years of Care.
Some people call once, for one thing. Many come back. Every part of the work is connected, and you decide how far to go and how fast.
You Choose
Time, Money and the Result.
Assess.
A conversation and a close look at how your home or building really performs today.
Decide.
You are shown your options and what each one costs in time, money and result. Then you choose.
Act.
Repair what is worth repairing. Upgrade what will help. Replace or design a new system only when it is truly the right answer. Or do nothing, if nothing is needed.
Verify.
The result is measured, so the work is proven rather than assumed.
Care.
Seasonal care keeps it healthy, so small things are caught early and the system lasts.
The Castle Standard
Sized by Measurement, Not Guesswork.
Square-footage rules of thumb often produce oversized equipment. An oversized system cools the room fast, shuts off, and never runs long enough to pull humidity out of the air: cold but clammy, and hard on the equipment. A castle is measured before it’s built. So is your system.
Room-By-Room Load Calculation.
ACCA Manual J: every window, wall and occupant, not a guess.
Equipment Matched to the Load.
Manual S: the right capacity and staging, not the biggest box.
Ducts Designed for Real Airflow.
Manual D: so every room actually gets the air it was promised.
Verified at the Install, Not Assumed.
Airflow, static pressure and refrigerant charge measured and documented.
A Typical New System
Assess. Design. Build. Verify.
Assess.
A diagnostic visit: airflow, static pressure, humidity, indoor air quality and how the home is actually performing.
Design.
Manual J, S and D calculations, equipment selection and duct design, shown to you as a written plan. He adjusts it with you until it is right.
Build.
Equipment coordinated, ordered and delivered, then installed under David’s direction, with care for the details nobody sees behind the drywall.
Verify & Maintain.
Commissioned with measurements, then maintained on a schedule so it keeps performing for years.
Castle Care Plan
Looked After Before It Needs Help.
Like a regular check-up, only for your heating and cooling. Two seasonal visits, scheduled for you, a plain report each time, and a first assessment included if something goes wrong. No upsell. One phone call to start.
Castle Care Plan
$000 per year, for one system
- Two seasonal visits: cooling in spring, heating in fall
- A written report after each visit, in plain words
- Your first assessment is free if something goes wrong
- Members are booked ahead of non-members
Photo needed: A portrait of David, ideally on site or with a finished install (480 x 560).
Meet the Owner
One Name on the Work.
David Carlsten has spent 15+ years in commercial and residential HVAC, and he runs Castle Comfort the way he thinks a home should run: as a system. He does the diagnostic, he does the design, and he leads the install, so there is no handoff where the details get lost.
He will tell you what he would do, what it costs, and what the trade-offs are, so the decision is yours, made with the facts.
“A house should feel like a castle: solid, quiet, and comfortable no matter what the weather is doing outside. That takes measuring, not guessing.”
- 15+ Years Experience
- ACCA Manual J / S / D
- EPA 608 Certified
- Fully Insured
Reviews
What Clients Say.
5 out of 5 stars
Placeholder review. Two other companies quoted us a bigger unit. David measured the house and explained why that would have made the humidity worse. He was right.
Client · Town, IL 5 out of 5 stars
Placeholder review. Showed up when he said he would, found the actual airflow problem in twenty minutes, and fixed it without trying to sell me a new system.
Client · Town, IL 5 out of 5 stars
Placeholder review. Designed and installed the system for our shop. Cleanest ductwork I have ever seen on a job site.
Business owner · Town, IL
Service Area
Serving Chicagoland and the Northwest Suburbs.
Scheduled service, home performance visits and design-build projects reach as far as Geneva, Joliet and Chicago. Not sure if you’re in range? Call and ask. If David can’t help, he’ll tell you who can.
- Crystal Lake
- Barrington
- Palatine
- Arlington Heights
- Libertyville
- Lake Zurich
- Algonquin
- Geneva
- St. Charles
- Joliet
- Chicago
Photo needed: A simple service-area map (520 x 380).
Ready for a Castle of Comfort?
A consultation starts with a conversation about how your home is behaving, not a sales pitch.