Heating and Cooling Services for New Castle County, DE
Hillside Oil Heating & Cooling is a full-service home heating oil and HVAC company proudly serving homeowners and businesses throughout New Castle County, DE. Whether you need heating oil delivery, furnace repair, air conditioning installation, or maintenance, we’re committed to keeping your home or business comfortable year-round.
Comprehensive Heating & Cooling Solutions
Heating Oil Delivery
We provide dependable heating oil delivery with automatic refill options, ensuring you never run out. Our oil heating system services include installing, maintaining, and repairing oil-fired furnaces, boilers, and burners to keep your home warm and efficient.
Heating Services
Our team specializes in gas, propane, and electric heating systems, including furnaces, boilers, heat pumps, and ductless mini-splits. Whether you need a new installation, routine maintenance, or emergency repair, we have the expertise to keep your system running smoothly.
Cooling Services
We offer installation, repair, and maintenance for central air conditioning and ductless mini-split systems. Improve indoor air quality with air purifiers, humidifiers, dehumidifiers, and high-efficiency filtration systems for a healthier home.
Service Plans
We offer comprehensive service plans to keep your heating and cooling systems running efficiently. Plans include HVAC maintenance, automatic oil delivery, budget-friendly billing, and an oil tank warranty program, providing peace of mind and cost savings.
Comfort Upgrades
Keeping your paws comfy all year involves more than heating and cooling products and services.
- Smart Device Control. Hillside sells and installs Smart thermostats, allowing remote temperature control from your smartphone or computer for convenient scheduling.
- Tankless Water Heaters. Hillside installs tankless water heaters, providing endless hot water, improved energy efficiency, and space-saving convenience.
Commercial Fuel Services
Hillside supplies diesel fuel and heating oil to businesses across Delaware, Maryland, and Pennsylvania. As the only oil company in New Castle County with a top-loading rack system, we provide competitive market pricing and 24/7 fueling at 40 Brookhill Drive, Newark, DE.
Call us to schedule any of our services at 302-738-4144 (DE&PA) or 410-398-2146 (MD).
REQUEST SERVICE
This contact form does not substitute for a service call request. Please call our office 302-738-4144 or 410-398-2146. Thank You.
Locations We Serve
New Castle County, DE — Heating Oil & HVAC Company
Join Over 5000 Customers Who Trust Hillside For
- Modern Energy-Efficient Products
- Exceptional Customer Service
- Fast and Flexible Scheduling
- Up-Front and Fair Pricing
- Industry Leading Warranties
- Excellent Service and Maintenance Plans
- Courteous and Professional Technicians
- Over 70 Years of Industry Expertise
THE TRUSTED COMFORT EXPERTS OF DE, MD, & PA
WE LOVE OUR CUSTOMERS
All of our work is guided by three generations of family attitudes and values – respect, loyalty, integrity, accountability, honesty, kindness. We pride ourselves on building excellent relationships with our customers, some of whom we have served for decades, and then gone on to serve their children for decades. Above all, we know what it’s like to be a customer and how we’d like to be treated.
That’s why we’re so honored to have received thousands of glowing ratings, reviews, recommendations, and testimonials from our heating and cooling customers. It means the care we put into our work shows through, and that we truly are doing customer service right.
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Scott FinneganOctober 6, 2026not recommends
2 yrs and counting since I reached out about one of their dipshit 'techs' verbally and physically assaulting me in a gym lobby and so far crickets, says a lot about the company.......Posted on Facebook![]()
Joe RoachJanuary 29, 2025recommends
Hillside is great for both repairs and major system replacements. Reasonable prices and great service!Posted on Facebook![]()
Lauren RiebelNovember 26, 2024recommends
This was our first time using this company & we will absolutely be using them again. Our technician was extremely knowledgeable & friendly. He really took the time to explain everything to us & didn’t try to sell us something new. I would 100% recommend this company to anybody in the area for any of your heating and cooling needs.Load more
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Matthew BurlewNovember 5, 2026
Ryan, Shawn and Olaf at Hillside were an excellent team. They replaced our HVAC system. They did fantastic work and spent sufficient time making sure we were comfortable with the new system. Thank youPosted on Google![]()
James HuntNovember 4, 2026
Had a separate quote from a different company for 8k worth of fixes. Mike from Hillside came out and gave me his expertise and retested my system. He was honest with me and gave me knowledge to help me make the correct decision. Mike saved me a boatload of money. Recommend Hillside for any type of heating and cooling work!Posted on Google![]()
Kenneth WohnerOctober 20, 2026
Tom was on time and did a fantastic job. I am very pleased with Hillside.Load more
Proudly Serving New Castle County, DE, Cecil County, MD and Southern Chester County, PA.