Expert Heating & Air Conditioning
Comfort You Can Count On
Licensed & Insured | Mon–Sat 7AM–5PM | Free Estimates
Complete HVAC Solutions
From routine maintenance to full system installations, D & K delivers expert HVAC services with the quality and integrity your home deserves.
AC Installation & Replacement
Upgrade to a high-efficiency cooling system with expert installation. We carry all major brands and size your system perfectly for maximum comfort and energy savings.
Heating Installation & Replacement
From furnaces to heat pumps, we install and replace heating systems with precision. Stay warm all winter with a reliable, efficient heating solution.
AC Repair & Maintenance
Fast, reliable AC repairs that get your system running again — often same day. Our maintenance plans extend equipment life and prevent costly breakdowns.
Heating Repair & Maintenance
Don't let a faulty heater leave your family in the cold. We diagnose and repair all heating issues quickly, with transparent pricing and no hidden fees.
Fast-Response HVAC Service
When your system stops working, you need help fast. D&K offers same-day and next-day appointments to get your heating or cooling back on track quickly.
Indoor Air Quality
Breathe cleaner, healthier air at home. We offer air purification systems, UV lights, humidifiers, and whole-house filtration to protect your family.
Not sure what service you need? Our experts will assess your system for free.
Why Thousands of Homeowners
Choose D & K
Licensed & Fully Insured
Every technician is state-licensed and fully insured. CA Contractor License #1100384. Your home and family are protected from the moment we arrive to the moment we leave.
Same-Day Service
We know HVAC problems can't wait. That's why we offer same-day appointments — most calls are answered and scheduled within the hour.
Upfront, Honest Pricing
No hidden fees. No surprise charges. You get a clear, written estimate before any work begins. The price we quote is the price you pay.
100% Satisfaction Guarantee
We stand behind every job we do. If you're not completely satisfied with our work, we'll make it right — no questions asked.
California Contractor License
#1100384
Fully Insured & Bonded
Protecting your home on every job
State of California
HVAC Certified Technicians
Ready to experience the D & K difference?
Free estimates on all installations & replacements
How It Works
Getting your HVAC system serviced has never been easier. Our simple four-step process gets you back to comfortable — fast.
Call or Request Online
Contact us by phone, form, or text. Our friendly team will listen to your situation and gather the details needed to prepare your appointment.
Free Assessment
A licensed D & K technician visits your home, performs a thorough diagnostic, and provides you with a clear written estimate — no obligations.
Professional Service
Our expert team completes your installation, repair, or maintenance with precision, using quality parts and following manufacturer specifications.
Guaranteed Satisfaction
Before we leave, we walk you through the completed work and answer all your questions. Your satisfaction is guaranteed — period.
Most service calls are completed same day — we respect your time and your home.
Based on 200+ reviews
What Our Customers Say
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“D & K came out to Vacaville same day when our AC died in a heat wave. Had it running in 2 hours. Super professional, honest pricing, no surprises. These are our go-to HVAC guys from now on!”
Sandra R.
April 2024 • AC Repair — Vacaville
“Best HVAC service in Fairfield. They replaced our furnace quickly and the price was very fair. The tech explained everything and left the place spotless. Highly recommend D & K to all my neighbors!”
Mike T.
February 2024 • Furnace Replacement — Fairfield
“Called D & K on a Sunday night when our heater went out. They answered right away and came to Benicia within the hour. Got our heat back on the same night. Amazing service — will always call them first!”
Jessica M.
December 2023 • Heating Repair — Benicia
“Got a free quote and they beat every estimate in Vallejo. The new AC they installed is incredible — house is cool and my electricity bill dropped. Five stars, no question. Very professional team.”
Carlos V.
June 2024 • AC Installation — Vallejo
“Called D & K for a tune-up in Suisun City and the tech found a refrigerant leak that could have been very expensive. Saved me a lot! Very thorough, honest and affordable. Couldn't be happier.”
Patricia L.
March 2024 • Maintenance — Suisun City
“D & K has serviced our home in Fairfield for 3 years. Every time — professional, on time, fair pricing. They just installed a new whole-home system and the difference is amazing. Wouldn't trust anyone else.”
Anthony B.
January 2024 • System Replacement — Fairfield
“D & K came out to Vacaville same day when our AC died in a heat wave. Had it running in 2 hours. Super professional, honest pricing, no surprises. These are our go-to HVAC guys from now on!”
Sandra R.
April 2024 • AC Repair — Vacaville
“Best HVAC service in Fairfield. They replaced our furnace quickly and the price was very fair. The tech explained everything and left the place spotless. Highly recommend D & K to all my neighbors!”
Mike T.
February 2024 • Furnace Replacement — Fairfield
“Called D & K on a Sunday night when our heater went out. They answered right away and came to Benicia within the hour. Got our heat back on the same night. Amazing service — will always call them first!”
Jessica M.
December 2023 • Heating Repair — Benicia
“Got a free quote and they beat every estimate in Vallejo. The new AC they installed is incredible — house is cool and my electricity bill dropped. Five stars, no question. Very professional team.”
Carlos V.
June 2024 • AC Installation — Vallejo
“Called D & K for a tune-up in Suisun City and the tech found a refrigerant leak that could have been very expensive. Saved me a lot! Very thorough, honest and affordable. Couldn't be happier.”
Patricia L.
March 2024 • Maintenance — Suisun City
“D & K has serviced our home in Fairfield for 3 years. Every time — professional, on time, fair pricing. They just installed a new whole-home system and the difference is amazing. Wouldn't trust anyone else.”
Anthony B.
January 2024 • System Replacement — Fairfield
Read what customers in Fairfield, Vacaville, Vallejo & Benicia are saying
Services We Deliver With Pride
From full system installations to precision repairs, every job is handled by our certified D&K technicians — committed to quality, reliability, and your lasting comfort.
Central AC Installation
High-efficiency central air system — full installation, permits and commissioning included.
Furnace Replacement
Variable-speed gas furnace replacement. Old unit removed, new high-efficiency system installed.
Ductwork Installation
Full home duct system — designed, sealed and balanced for maximum airflow efficiency.
Smart Thermostat Upgrade
Smart thermostat installation and programming for precise climate control and energy savings.
Mini-Split Ductless System
Multi-zone ductless heat pump — perfect for home additions and areas without existing ductwork.
Commercial Rooftop Unit
Rooftop packaged unit installation for commercial building. Crane lift, start-up and full controls.
Ready to add your home or business to our portfolio?
Don't Let Budget
Stop Your Comfort
A new HVAC system is an investment in your home and your family's comfort. Our flexible financing options make it possible to get the system you need — today, not someday.
0% APR for 12 months
On qualifying systems and installations
Same Day approval
Quick and easy online application
* Subject to credit approval. Terms and conditions apply. Ask our team for full details on available financing programs.
Serving the Greater Fairfield & Surrounding Area
We provide fast, reliable HVAC service to homeowners and businesses throughout the region. Call us to confirm coverage in your area.
Cities & Communities We Serve
Don't see your city? Call us — we may still be able to help.
Schedule Your HVAC Service
We offer same-day and next-day appointments across our service area, Monday through Saturday, 7AM to 5PM.
Call Us: (707) 344-0030Get Your Free Quote Today
Fill out the form and we'll get back to you within 1 hour during business hours. For emergencies, call us directly.
Contact Information
Business Hours
Prefer to talk? Give us a call during business hours and we'll get you scheduled right away.
(707) 344-0030Fast Response Guaranteed
We respond to all quote requests within 1 hour during business hours, Monday through Saturday, 7AM to 5PM.
CA Contractor License
#1100384
Licensed • Insured • Bonded