Interstate Heating Co Inc
HVAC Services in Sussex
Interstate Heating Co Inc specializes in Carrier HVAC installation, repair, and maintenance. Proudly serving Sussex and the surrounding areas for more than 64 years, we deliver reliable, certified HVAC solutions to meet your home's needs. We are a family-owned and operated business, and as your local Carrier Factory Authorized Dealer, we make your satisfaction our top priority. That's why we stand behind our work with a 100% satisfaction guarantee. Equipped with certified technicians, we strive to exceed your expectations, whether performing routine maintenance or installing a new Carrier heating and cooling system. Our commitment to quality and excellence is evident in every job we undertake. Trust us to provide top-tier HVAC solutions and keep your home comfortable year-round.
Experience and Certifications
Experience and Certifications
Factory Authorized Dealer
As a Carrier Factory Authorized Dealer, we have met Carrier's highest standards for superior skills, service, and we proudly offer a 100% satisfaction guarantee.
NATE Dealer
North American Technician Excellence (NATE) is the leading certification program for HVAC technicians and is the only test supported by the entire industry. We are proud to employ NATE certified technicians.
Distinguished Dealer
The Distinguished Dealer Award is an annual award given to a select group of Carrier Factory Authorized Dealers who achieve high scores on a set of criteria established each year by the Carrier brand. It spotlights our company as an exceptional Carrier dealer whose products and services consistently meet high levels of excellence.
Financing Available
We offer flexible financing options for your new Carrier product or system. With approved credit, you can enjoy convenient monthly payments, competitive interest rates, and online bill pay.
Cool Cash
We participate in Carrier Cool Cash rebates. With the support of Carrier, during select times of the year Cool Cash rebates might be available when you purchase a qualified Carrier heating and cooling system.
Geothermal Installations
We are proud to install Carrier geothermal heat pumps, which harness Earth's natural energy and consistent underground heat instead of relying on outside air like traditional heat pumps.
Indoor Air Quality Experts
Proper indoor air quality requires more than an air conditioner. As Carrier Indoor Air Quality Experts, we have completed coursework and passed a comprehensive test to deliver a cleaner, healthier home environment.
Factory Authorized Dealer
As a Carrier Factory Authorized Dealer, we have met Carrier's highest standards for superior skills, service, and we proudly offer a 100% satisfaction guarantee.NATE Dealer
North American Technician Excellence (NATE) is the leading certification program for HVAC technicians and is the only test supported by the entire industry. We are proud to employ NATE certified technicians.Distinguished Dealer
The Distinguished Dealer Award is an annual award given to a select group of Carrier Factory Authorized Dealers who achieve high scores on a set of criteria established each year by the Carrier brand. It spotlights our company as an exceptional Carrier dealer whose products and services consistently meet high levels of excellence.Financing Available
We offer flexible financing options for your new Carrier product or system. With approved credit, you can enjoy convenient monthly payments, competitive interest rates, and online bill pay.Cool Cash
We participate in Carrier Cool Cash rebates. With the support of Carrier, during select times of the year Cool Cash rebates might be available when you purchase a qualified Carrier heating and cooling system.Geothermal Installations
We are proud to install Carrier geothermal heat pumps, which harness Earth's natural energy and consistent underground heat instead of relying on outside air like traditional heat pumps.Indoor Air Quality Experts
Proper indoor air quality requires more than an air conditioner. As Carrier Indoor Air Quality Experts, we have completed coursework and passed a comprehensive test to deliver a cleaner, healthier home environment.
HVAC Repair and Services
AC Repair & Service
We specialize in fast, reliable air conditioner repair and service to keep your home cool and comfortable. Whether it’s a minor fix or a major repair, we're here to ensure your AC runs smoothly when you need it most.
Furnace Repair & Service
We provide expert furnace repair and service. Our skilled technicians are ready to quickly diagnose and resolve any issues, keeping your home warm and comfortable year-round.
Emergency HVAC Repair
We understand that HVAC emergencies can’t wait—that’s why we offer 24/7 emergency repair service to restore your comfort quickly. No matter the time or weather, we're here to get your heating and cooling system back up and running.
Heat Pump Repair
Count on us for dependable heat pump repair and service to keep your home comfortable year-round. Our experienced technicians troubleshoot issues, perform timely repairs, and ensure your system is operating at its highest efficiency.
HVAC Maintenance
We offer annual HVAC maintenance to keep your system running efficiently and help prevent unexpected breakdowns. Through a thorough inspection and tune-up, we ensure your heating and cooling system is ready to keep you comfortable all year long.
HVAC Installation Services
AC Installation
Enhance your home’s cooling and energy savings with our expert AC installation services. We install high-performance Carrier air conditioners and customize each system to match your home’s needs, helping ensure dependable comfort all summer long.
Furnace Installation
Stay warm and worry-free with our professional furnace installation services. We’ll guide you in selecting the best Carrier furnace for your home and complete the installation with expert care and precision.
Heat Pump Installation
Upgrade your home’s comfort and efficiency with our professional heat pump services. Our team installs top-quality Carrier heat pumps and tailors every system to fit your space, delivering reliable performance through every season.
HVAC System Installation
We provide expert HVAC installation to keep your home comfortable year-round. Whether you're replacing your current system or installing HVAC for the first time, we'll help you choose the right solution for your needs and handle the installation with precision and care.
About Interstate Heating Co Inc
Emergency 24-hour service available.
Years in Business
64
Trusted HVAC Professional in Sussex
Verified Purchaseknowledgeable
April 14, 2026
Figured out which equipment failed and checked to make sure the warranty covered all.
DAVE
Expertise (5)
Solve Problems (5)
Service (5)
Verified PurchaseGreat work
May 22, 2025
Very satisfied with the quality of products and installations
JOSEPH
Expertise (5)
Solve Problems (5)
Service (5)
Verified Purchaseknowledgeable and efficient
April 28, 2025
They are the best!
JOHN
Expertise (5)
Solve Problems (5)
Service (5)
Verified PurchaseGreat
April 15, 2025
Great
MADAN
Expertise (5)
Solve Problems (5)
Service (5)
Verified PurchaseVery good service
April 09, 2025
Better price and good service
MARY
Expertise (5)
Solve Problems (5)
Service (5)
Verified PurchaseRecommend, but only with caution and owner diligence
March 23, 2025
While we would generally recommend this dealer for their professionalism and responsiveness, we remain disappointed with the lack of an absolute solution for condensation on the air return ducts when very cold air is brought in. Two other scenarios affected our "first impression": (1) week 1 of having the house, we had to tighten a water line to the humidifier which was leaking water to the basement floor, and (2) when cooling season began, we discovered that the compressor on the A/C unit was shot (no cooling!), and the entire unit needed to be replaced.
NAT
Expertise (5)
Solve Problems (3)
Service (4)
Verified Purchasefonder builders
March 06, 2025
excellent guys and service
KEITH
Expertise (5)
Solve Problems (5)
Service (5)
Verified PurchaseGreat Service with Interstate Heating, Sussex
December 30, 2024
Excellent Service and installation
GERALD
Expertise (5)
Solve Problems (5)
Service (5)
Verified PurchaseInterstate Heating of Sussex, WI.
April 19, 2018
Service personnel are professional and knowledgeable. I have had excellent service from this company for the last 20 years.
Kenneth
Expertise (5)
Service (5)
Solve Problems (5)