ductless mini-split installation Darien

When the summer heat hits Darien, you need an AC system that works hard and quietly. At HPC Mechanical, we handle everything from central air conditioning and ductless mini-splits to high-efficiency heat pumps. We size every system correctly — no guesswork — so it cools evenly, runs efficiently, and lasts for years.

Our process starts with a thorough load calculation and a walkthrough of your home or business. We explain your options in plain English, then install cleanly and test every component. If your existing system is struggling, we also offer fast, reliable repairs. From a single mini-split in a guest room to whole-home central air, we make sure your space stays comfortable without breaking the bank.

Why choose us? We've been serving Darien since 1977, we're fully licensed and insured, and we never recommend a system you don't need. Plus, our maintenance plans keep your AC in top shape year after year. Call us for a free estimate and beat the heat with confidence.

New England winters are no joke, and a broken furnace or boiler can turn your home or business into an icebox fast. HPC Mechanical provides expert heating services across Darien, including furnace repair and replacement, boiler service, hydronic systems, and modern heat pumps. Whether you need emergency heat on the coldest night of the year or a full new-construction install, we respond fast and fix it right.

Our technicians are trained on all major brands and fuel types — gas, oil, electric, and propane. We start with a diagnostic to find the root cause, then give you an honest quote with no pressure. If repair isn't cost-effective, we'll walk you through replacement options that save you money on energy bills. For new builds, we handle everything from load calcs to equipment selection and ductwork detailing.

We're known across Darien for showing up on time, keeping the work area clean, and explaining everything in plain language. With nearly 50 years in the family, we're not going anywhere — and we stand behind every heating job we do.

Commercial HVAC systems are a different beast — and HPC Mechanical has a dedicated team that knows how to handle them. We work with property managers, general contractors, and business owners across Darien to install, repair, and maintain rooftop units, VRF systems, chillers, boilers, and make-up air units. From a single office retail space to a multi-tenant building, we have the experience to get the job done on time and on budget.

Our commercial process is built for minimal disruption. We stage equipment carefully, coordinate with your schedule, and communicate every step of the way. For replacement projects, we do a full site assessment, load calc, and equipment selection to ensure efficiency and longevity. And our maintenance plans keep your systems running at peak performance, avoiding costly downtime.

We've completed projects for restaurants, retail stores, offices, and multi-tenant buildings across Darien. Our team is fully licensed, insured, and backed by a family-owned company that's been around since 1977. Get a free estimate for your commercial HVAC project today.