Carl F. Riedell & Son works out of Osterville and covers Cape Cod for plumbing, heating and air conditioning, and the volume of feedback is unusual for a local trade business: Google carries a 5.0 average across 913 ratings, and 32 reviews landed in the last six months alone. A Cape Cod Times business spotlight in March 2026 described it as a family-run firm focused on installation, maintenance and repair of HVAC systems suited to the coastal climate.
The thing customers return to is response time in a no-heat emergency. One reviewer lost heat during the coldest stretch of the 2026 winter and had a technician on site within thirty minutes, then a second representative within the hour to price a replacement furnace once the old one proved not worth fixing. Another woke with no heat or hot water in late 2025 after their previous company offered a two-to-three-day emergency wait list, and had someone out in about an hour. A Saturday-morning no-heat call in February 2026 brought a technician who kept the homeowner informed through the diagnostics and then shovelled the porch entryway on his way out. Same-day scheduling shows up even for people who had not called in six years.
The crew gets named constantly and warmly — Nick, Olivia, Derek, Glenn, Remy, Matthew, Guy, and Jason Oslund in the service department, who an account manager at a Cape building company calls their first call for service and emergencies. Olivia in particular is singled out repeatedly, on both furnace maintenance and plumbing work. Reviewers describe technicians introducing themselves, explaining the system in plain terms, and cleaning up so thoroughly that one customer said they would not have known anyone had been there.
The work spans both trades. On the mechanical side: air-conditioning installation, boiler and furnace servicing, thermostat replacement, duct and filter work, and service contracts. On the plumbing side: faucets, outdoor showers and hose bibs, toilet repairs and replacements, and whole-house shut-off valve replacement. The Better Business Bureau, which grades the business A+, also lists new construction, remodels, hot water tank installation and water filtration through its Advanced Water Systems arm.
Two things are worth raising before you book. A 2024 reviewer was billed $200 for a fifteen-minute hose connection on a furnace and said they would not use the company again — so ask how service calls are billed, minimums included. And the one Massachusetts licence record found under the company's own name, HVAC registration 775-SM-B, is verified as expired, so it is fair to ask which current licences and which licensed individuals will cover your particular job.