Ductless Mini-Split Installation & Service

No ductwork, no problem — a properly installed mini-split gives you year-round comfort in any room of your home.

A lot of homes in central Massachusetts were never built with central ductwork, and adding it is not always practical or affordable. Older homes in Winchendon, Athol, Gardner, and the surrounding towns frequently have rooms or additions that are either too hot in the summer or too cold in the winter — sometimes both. A ductless mini-split solves that problem cleanly and efficiently. It heats and cools without requiring any ductwork at all, and when it is installed correctly, it performs better than most homeowners expect. At Shelly Heating and Cooling, we install mini-splits that actually work — sized right, mounted correctly, and set up to run efficiently from day one.

We install single-zone systems for individual rooms and multi-zone systems for homes that need independent temperature control across multiple spaces. Whether you are adding comfort to a finished basement, a home addition, a garage workshop, or a room that has always been a problem, we handle the complete installation from start to finish. We also service existing mini-split systems that are underperforming, making noise, leaking, or failing to heat and cool properly. Mini-splits require specific knowledge to diagnose and repair correctly, and we work on them regularly across Worcester County, Franklin County, and southern New Hampshire.

If you have been putting up with a room that is never the right temperature, or you are looking for an efficient way to add heating and cooling to a space without a major renovation, a mini-split is worth a serious look. Call Shelly Heating and Cooling at (978) 868-3403 and we will walk you through what makes sense for your home and give you honest pricing before any work begins. We are available 24 hours a day across the entire service area.

What We Offer:

Single-Zone Mini-Split Installation — We install single indoor and outdoor unit systems for individual rooms or spaces that need independent heating and cooling without connecting to a central system.
Multi-Zone Mini-Split Installation — For homes that need comfort control across multiple rooms, we install multi-zone systems with one outdoor unit serving several indoor air handlers — each with its own temperature setting.
Ductless System Replacement — When an existing mini-split has reached the end of its useful life or is no longer performing efficiently, we remove the old equipment and install a properly sized replacement.
Mini-Split Repair — All Brands — We diagnose and repair ductless systems that are not heating or cooling properly, including refrigerant leaks, drainage issues, sensor failures, board faults, and outdoor unit problems.
Refrigerant Service & Leak Repair — Low refrigerant is a common cause of mini-split performance problems. We locate the leak, repair it at the source, and recharge the system to the manufacturer's specification.
Drainage Line Cleaning & Repair — Clogged or damaged condensate drain lines cause mini-splits to leak water indoors. We clean and repair drainage systems as part of both service visits and repairs.
Post-Installation Testing & Setup — Every installation includes a full operational test in both heating and cooling modes, plus a complete walkthrough of how to operate and maintain your new system.

Why Choose Shelly Heating and Cooling for Ductless Mini-Split Installation & Service

Right System for Your Specific Space — Not every mini-split is right for every room. We assess the space, calculate the correct capacity, and recommend a system that will actually maintain the temperature you want — not one that short-cycles or runs constantly trying to keep up.
Clean, Professional Installation — The quality of a mini-split installation shows in how it looks and how it performs long-term. We run lines neatly, mount units securely, and leave your home looking the way we found it. No messy line sets, no shortcuts on the electrical work.
Experience With Older New England Homes — Homes across Winchendon, Gardner, Athol, and surrounding towns were built in eras when ductwork was not standard. We understand the construction styles common in this region and know how to install mini-splits in older homes cleanly and efficiently.
Full Service — Installation Through Repair — We do not just install systems and move on. If your mini-split needs service down the road, we handle that too. Having one contractor who knows your system makes repairs faster and more accurate than starting from scratch with someone new.
24/7 Availability for Repairs — A mini-split that stops heating in January is an emergency just like any other heating failure. We are available around the clock for ductless system repairs across Winchendon and the broader service area. You will reach a real person when you call.