Local and Family-Owned: Proudly serving Longmont and communities across Colorado’s Front Range since 2007.
Heating Services in Longmont, CO
St. Vrain Valley winters bring freezing temperatures that demand dependable heating in Longmont, CO. Mountain Valley provides same-day heating repair, replacement, installation, and maintenance to keep your home warm, efficient, and comfortable throughout the season. Our background-checked technicians service furnaces, boilers, and heat pumps using proven diagnostic methods, and you’ll always receive upfront, flat-rate pricing before work begins. Every visit is backed by our Safe Clean Home Guarantee to protect both your home and your peace of mind.
Certified Heating and Plumbing Experts in Longmont

Complete Heating Solutions in Longmont and Surrounding Areas
Mountain Valley Plumbing, Heating and Cooling provides residential heating services throughout Longmont, CO, and nearby communities across Boulder and Weld counties. Whether you live in Old Town, Prospect New Town, Twin Peaks, Southmoor Park, or another nearby neighborhood, our technicians understand the demands of Colorado winters and deliver dependable heating solutions designed for the Front Range climate.
Whether your system needs a simple repair or a complete replacement, our technicians will recommend the most effective solution based on its condition, age, and efficiency. We repair furnaces, service hydronic boiler systems, and install high-performance cold-climate heat pumps designed for Colorado’s demanding winters. Every system is carefully tested, adjusted, and calibrated to perform safely and efficiently at Longmont’s high elevation.
Safe Steps to Take Before Calling for Furnace Repair
If you smell gas or suspect carbon monoxide, leave your home immediately and contact emergency services before attempting any troubleshooting. For common heating issues that don’t involve an emergency, these simple checks may save you time and help identify the problem before scheduling a service visit.
Thermostat Settings: Confirm the thermostat is set to HEAT and that the temperature is higher than the current room temperature.
Breaker and Power Switch: Check for a tripped circuit breaker and verify the furnace power switch is turned on.
Air Filter and Vents: Inspect the air filter for excessive buildup and make sure all supply and return vents remain open and unobstructed.
LED Error Codes: If your furnace displays flashing diagnostic lights, note the code before restarting the system so your technician can diagnose the issue more efficiently.
If you’re comfortable performing basic furnace maintenance, you may carefully clean the flame sensor after turning off the power. Stop immediately if you notice cracked porcelain or signs of damage. Because Longmont’s high elevation affects combustion performance, our technicians fine-tune and test every gas heating system according to the manufacturer’s specifications.
What to Expect From Our Heating Technicians
Our background-checked technicians treat your home with care from the moment they arrive. They wear clean uniforms and protective shoe covers to help keep your floors clean while they work. After inspecting your heating system, we’ll explain our findings clearly, answer your questions, and provide upfront, flat-rate pricing before any repairs or replacements begin.
Every service visit is backed by our Safe Clean Home Guarantee. If one of our technicians accidentally causes damage to your home while performing the work, we’ll repair it at no additional cost and provide your family with a dinner gift card while everything is made right.
Ready to schedule service? Call our team at (970) 317-2519 or request an appointment through our online contact form.
Transparent Heating System Pricing and Rebates in Longmont
We begin every service call with a flat-rate diagnostic fee that covers travel to your home and a thorough evaluation of your heating system. Before any work begins, you’ll receive clear, upfront pricing so you can make an informed decision. If your system needs to be replaced, several factors may influence the total project cost:
- Equipment Type: The size, efficiency rating, and type of heating system you choose, such as a furnace, boiler, or heat pump.
- Required Modifications: Updates to gas lines, electrical components, ductwork, or other parts of your home’s HVAC system.
- High-Altitude System Adjustments: Additional testing and calibration to help your equipment operate safely and efficiently in Longmont’s elevation.
During your estimate, we’ll help you identify available savings opportunities, including local utility rebates, federal tax credits, and qualifying state incentives for energy-efficient heating systems. If your project requires permits or inspections from the City of Longmont, our team will coordinate the entire process to help ensure your installation meets local code requirements.
Frequently Asked Questions About Longmont Heating Services
Do you offer same-day heating repair in Longmont?
Yes. We offer same-day heating repair in Longmont whenever scheduling allows during normal business hours. Calling our office is usually the fastest way to request service, while our online form is a convenient option for non-urgent appointments. Before we arrive, it helps to have your system’s model number, any error codes, and a description of the symptoms you’re experiencing.
How much does heating repair usually cost in Longmont?
Heating repair costs vary because every heating system and repair is different. We begin with a flat-rate diagnostic visit to identify the problem, then provide upfront pricing before any work begins. Final costs depend on the type of repair, replacement parts, the condition of your system, and any additional safety or code requirements.
Should I repair my furnace or replace it?
The right choice depends on your furnace’s age, condition, repair history, and overall efficiency. If your system is more than 15 years old, needs frequent repairs, or has a cracked heat exchanger, replacement is often the better long-term investment. For newer systems with isolated mechanical or electrical issues, a professional repair is typically the most cost-effective solution.
Do I need a permit to replace a furnace in Longmont?
Yes. The City of Longmont requires a mechanical permit and a final inspection for furnace replacements. These requirements help verify that your new heating system meets local building and safety codes. Our team handles the permitting and inspection process from start to finish, making the installation as straightforward as possible for you.
Are heat pumps reliable for Longmont winters?
Yes. Modern cold-climate heat pumps perform reliably in Longmont when they’re properly sized and professionally installed. Many homeowners choose a dual-fuel or hybrid system that combines a heat pump with a gas furnace. The heat pump provides efficient heating during milder temperatures, while the furnace takes over during periods of extreme cold.
Do you service boilers in Longmont neighborhoods like Old Town and Prospect New Town?
Yes. Our technicians service boiler systems throughout Longmont, including historic neighborhoods like Old Town and newer communities such as Prospect New Town. Whether you need routine maintenance, system flushing, repairs, or control upgrades, we have experience working with hydronic heating systems commonly found in older Colorado homes.
Reliable Heating in Longmont, CO
Mountain Valley has served Longmont homeowners since 2007, delivering dependable heating repair, system replacements, and heat pump installations backed by a 4.9-star reputation. Every visit includes flat-rate pricing, background-checked technicians, and our Safe Clean Home Guarantee. Call today to schedule your service.






