Your Home. Your Comfort. Our Priority.

From HVAC system installs to dependable repairs and preventative maintenance, we’ve got your comfort covered.

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Give us a Call/Text: 302.834.0556
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Clark Services was built on a foundation of hard work, craftsmanship, and family values, long before the business ever had a name.

Our founder and owner, Mark Clark began learning the HVAC trade as a teenager, following in the footsteps of his father and grandfather. From an early age, he was immersed in the industry, developing a deep respect for doing things the right way and taking pride in quality work. While still in high school, Mark spent half of his days at Hodgson vocational-technical school, gaining hands-on experience and mastering the fundamentals of the trade.

At just 18 years old, Mark officially began his career in HVAC with a well-known Delaware company, Burns & McBride. There, he learned every aspect of the business, from routine maintenance and service repairs to full system installations and sales. Early on, he developed extensive experience working with oil furnaces and boilers, building a level of knowledge that only comes from years in the field.

By his early 30s, Mark took a leap of faith and started Clark Services with a simple goal: provide honest, high-quality HVAC work and treat customers the way he would want his own family treated. Nearly 30 years later, that same philosophy continues to guide the company.

Clark Services has grown steadily over the decades with minimal advertising and a strong reliance on word-of-mouth referrals,a true testament to the trust and loyalty of our customers. What began as a small operation serving a limited area has expanded to proudly serve homeowners across the entire state of Delaware.

Today, Mark leads an experienced and dedicated team, including one of his three daughters, who helps oversee day-to-day operations and ensure the same level of care and attention is delivered to every customer. Despite the company’s growth, Mark remains deeply involved: still running service calls, checking on installations, driving the oil truck, and even answering the phones.

At Clark Services, we believe comfort starts with trust. And for nearly three decades, that trust has been earned one home at a time.

The Clark Services Story

Our Services

  • Preventative maintenance helps keep your heating and cooling system running smoothly and efficiently throughout the year. During a maintenance visit, our technicians inspect key components, check system performance, and address minor concerns before they turn into larger issues.

    Regular maintenance can improve comfort, support system efficiency, and help extend the life of your equipment. Giving you added confidence in your home’s comfort year round.

  • We offer free estimates on new systems and system replacements to help you plan with confidence. Our team takes the time to understand your needs, review your options, and provide clear, straightforward information. So, you can make informed decisions about your home’s comfort without any obligation.

  • When your heating or cooling system is outdated, inefficient, or constantly breaking down, a full HVAC system replacement can restore comfort, reliability, and energy savings to your home. We provide expert guidance to help you choose the right system for your space, budget, and comfort needs.

    Our team handles every step of the process, from evaluating your current system and home layout to professionally installing your new, high efficiency equipment. We take the time to ensure proper sizing, safe installation, and optimal performance so you can enjoy consistent comfort year round.

    With honest recommendations, quality equipment, and experienced technicians, we make replacing your HVAC system a smooth, stress-free experience.

  • Noticing an issue with your heating or cooling system? Our Service/Diagnostic visit is designed to identify the source of the problem and help you understand what’s going on. Our technicians carefully evaluate your system, explain their findings, and walk you through your options before any work is done.

    Whether the concern is small or more complex, we’re here to help restore comfort to your home.

  • We offer dependable heating oil delivery to homes throughout New Castle County, Delaware. Our oil delivery service is designed to help keep your home comfortable during the heating season, with timely deliveries and clear communication you can count on.

    Whether you schedule deliveries in advance or need support during colder months, our team is here to help ensure your home stays warm and well supplied.

Work With Us

  • "Had a heating emergency this morning and a friend recommended Clark Services. Never used them before and couldn't be happier with the response and service! They arrived less than an hour later. Two very knowledgeable and professional experts resolved my issue, answered some other questions I had and set me up on a maintenance program to stay on top of any future issues. They will be my go-to from now on and I would HIGHLY recommend them! Thanks also to Sarah and Brittany for the awesome scheduling and post work follow-up. The entire group turned a frustrating day into an awesome experience!"

    —Don C

    Rehoboth Beach, DE

  • "I had Clark Services complete our annual tune up for our HVAC system and was extremely impressed. Our previous company never went over their findings and always made comments that made me question whether they actually knew how to work on my system or not. Don was extremely knowledge and great to deal with. You can tell he has many years of knowledge and a great asset to the company. I’d highly recommend Clark services to all of my friends and neighbors."

    —John G

    Middletown, DE

  • "Big shout out to Clark Services on this bitterly cold night. Called them when heat suddenly stopped working, they were out and had us up and running in just over an hour. A million thanks to tech John!"

    —Jenny K

    Milton, DE

  • "Great service / experience! John was very helpful and professional. He went the extra mile to make sure everything was working properly and explained best practices/ procedures for the Heat pump settings. I highly recommend the company!"

    —Samuel P

    Rehoboth Beach, DE

  • "Clark Services provide an exceptional level of service. Just completed 2 installs for me. Highly recommend. Thanks to Mark and his team!"

    —Ron B

    Lewes, DE

  • "Honest. Fairly priced. Reliable. Outstanding service. Quality workmanship."

    —Robert W

    Rehoboth Beach, DE

  • "We enjoyed everything about our old system breaking down and how fast they came to get the old one running, until we could get the new one installed. John, Mark, Dylan and all the technicians and Brittany in the office were wonderful to work with. I would recommend them to my family and friends. Thank you, Mark, Clark Services, INC. of Delaware, and associates. Excellent job!"

    —Jane L

    Rehoboth Beach, DE

  • "I've been using Clark's for 20 years and they are consistently fabulous. My heater broke and the tech was out same day on a Sat. My call was promptly returned. He informed me every step of the way what was happening and my heater was fixed accordingly! I can't speak more highly of the company."

    —Heather K

    Clayton, DE

  • "I was very pleased with this experience from beginning to end, starting with placing the phone call to problem solving the issues. A technician came out immediately (on a Sunday morning) who was patient, thorough and went above and beyond. I would highly recommend this small, locally owned business!"

    —Elisa B

    Millsboro, DE

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