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Claim This BusinessL&M HVAC & Mechanical operates from Westminster, Colorado with a perfect 5-star rating across 188 reviews, earning the kind of recommendation rate most contractors spend years chasing. Mike and his team handle residential and light commercial projects throughout the Denver metro area, including Westminster, Broomfield, Thornton, and Arvada. The company holds active Colorado contractor licenses and maintains 24/7 availability because heating and cooling emergencies do not wait for business hours. Carol DiBiase-Ruffe, a homeowner in her 60s, chose L&M over several competing bids after finding Mike through the Rheem website, noting his down-to-earth approach during a full system replacement. Commercial general contractors have also enlisted L&M for subcontract work, citing on-time arrivals and smooth coordination on active job sites.
Mike and the L&M crew specialize in high-efficiency system replacements rather than piecemeal repairs, often guiding homeowners toward heat pump and furnace combinations that lower monthly utility costs over time. The company works directly with Rheem, a manufacturer Carol referenced when she first found their name during her research phase. Several reviewers mentioned Mike provided financing options during the sales process, making a full system swap more manageable for homeowners on fixed incomes. The crew also accommodates specific scheduling constraints, keeping clients informed of arrival windows and expected work durations before tearing into any project.
Mike arrived at Tonya Mecum's home within days of her 22-year-old furnace giving out, installing a heat pump and furnace combo that took two days and included a complete cleanup afterward. Carol DiBiase-Ruffe received a full Rheem system swap with Lee and Darian assisting Mike, with the crew placing tarps on stairs and rolling debris toward themselves as they exited to leave her carpet spotless. Mike fixed Karen Krupicka's thermostat replacement in a single visit, honoring a senior discount on a job she expected to cost significantly more. Chad Lemanski called L&M for multiple service visits and found Mike either on time or early each time, with the team's diagnostic assessments proving accurate enough to earn long-term trust from a repeat customer.
All five reviewers award 5 stars while specifically naming Mike, Lee, or Darian. Four of five customers describe same-day or next-day response times following system failures. Three reviewers mention Mike provided options like financing or senior discounts, while two highlight the crew's post-installation cleanup habits.
| Sunday | Closed |
| Monday | 7 AM–5 PM |
| Tuesday | 7 AM–5 PM |
| Wednesday | 7 AM–5 PM |
| ThursdayToday | 7 AM–5 PM |
| Friday | 7 AM–5 PM |
| Saturday | Closed |
Mike and Lee swap aging Rheem and other brand units for high-efficiency systems, including two-day installations with full cleanup after the retrofit.
L&M recommends dual-fuel setups that lower monthly costs, as seen in Tonya Mecum's 22-year-old furnace replacement project.
Karen Krupicka received a thermostat swap with no issues, and Mike honored a senior discount on the parts and labor.
Andrew Coles, a commercial contractor, hired L&M as a subcontractor for active builds, citing on-time arrivals and smooth site coordination.
Chad Lemanski booked multiple service visits and noted Mike arrived on time or early for each diagnostic call, with accurate repair recommendations.
L&M performs seasonal checkups on installed systems, keeping heat pumps and furnaces operating efficiently through Colorado winters.