When you’ve been in the heating business long enough, you see just about everything—but it never gets easier hearing from a homeowner who’s been left without heat. This fall, we got a call from a homeowner in Shrewsbury, MA in exactly that situation: a furnace replacement gone wrong, no permits pulled, and a house growing colder by the day.
What started as a search for a “good deal” had turned into a stressful—and potentially dangerous—mess. She wanted to switch from an old, oversized oil furnace to a high-efficiency propane system, but instead ended up with no heat at all.
Here’s how we stepped in to complete an oil-to-propane furnace conversion in Shrewsbury, MA the right way and got her heat back on safely and efficiently—just in time for winter.
When a “Half-Price” Furnace Replacement Costs Twice as Much
The homeowner had done what most people do before a big project—she collected several quotes. Three reputable contractors all came in around the same range. Then she found a fourth option that looked too good to pass up: roughly half the cost of the others.
Unfortunately, the saying “you get what you pay for” proved true. Within a day of starting the job, the contractor had already removed the existing oil furnace and started work without a permit. His workmanship was sloppy, and his behavior quickly crossed professional lines. Feeling uncomfortable and unsure, the homeowner asked him to leave.
By then, the damage was done—her furnace was gone, and her home was without heat in early October.
Licensed HVAC Contractor Steps In After Unpermitted Furnace Work Causes Damage, Breaks Trust
After the incident, she reached back out to the original companies that had bid on the job, but almost everyone passed. Once another contractor has torn out equipment without permits, you’re walking into a half-finished system with unknown damage and a lot of potential liability. Most companies didn’t want to inherit someone else’s mistakes. We were the only contractor willing to step in, sort out what had been done, and take responsibility for getting her heat back on safely.
When we arrived, the house was small—about 900 square feet—but the old oil system had been oversized and inefficient, with a roughly 80% annual fuel utilization efficiency (AFUE). That meant for every dollar she spent on oil, about 20 cents went right up the chimney.
She also wanted to switch from oil to propane, which was a smart move for her space and budget. But doing that correctly required the right equipment sizing, proper venting, and clean, code-compliant installation.
Load Calculation Ensures Your Furnace Isn’t Burning Money
We started by doing what should have been done from the start: a proper load calculation. That step tells us exactly how much heating capacity the home needs—not too little, not too much. Oversized furnaces, which are common in older homes, run in short bursts that waste energy and cause uneven temperatures.
Once we determined the correct size, we installed a propane furnace that was appropriate for the space. Every aspect was permitted, inspected, and done by the book.
Because the homeowner had understandably lost trust in contractors, we worked through her brother-in-law at first, giving her space to feel comfortable. By the end of the job, she was reaching out directly, asking questions, and ready to learn more about how her new system worked.
Comfort and Energy Savings After an Oil-to-Propane Furnace Conversion
By the time we finished, the home had heat again—before the next cold snap hit. The difference in comfort was immediate. The new system runs quietly, evenly, and efficiently, keeping her home warm without the wild temperature swings she’d dealt with before.
In practical terms, the new furnace performs at 96% efficiency— meaning she’s now keeping about 96¢ of every heating dollar, compared to only 80¢ before. That’s better comfort, less waste, and a system that will serve her well (and save her money!) for years to come.
Is Your Home Heating System Ready for Winter?
It’s easy to underestimate how much experience and integrity matter in this business. When you invite someone into your home to handle your heating system, you’re trusting them with your comfort, your safety, and your peace of mind. That’s a level of trust we take seriously.
Permits, load calculations, and code compliance aren’t red tape—they’re what protect you from headaches like this one. And when something does go wrong, having a contractor who’s willing to step in, take responsibility, and make it right can make all the difference.
If your system isn’t keeping up—or if you’re worried about efficiency heading into winter—reach out. We’ll make sure your home heating system is sized, installed, and running exactly the way it should.