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Best boiler installation pros near Longmont, CO

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    Verified boiler installation services reviews

Top-Rated Boiler installation pros in Longmont - Updated Nov 2026

Avatar for Heart Heating, Cooling, Plumbing & Electric
Heart Heating, Cooling, Plumbing & Electric
4.7(
92
)
Gas Boiler or Radiator Heating System - Install

Serving Longmont, CO and surrounding areas

Approved

Super Service Award Winner

In business since 2019

Free estimates

Emergency services offered

"I contacted the home office for an appointment on Monday this week, and they got me on the schedule for the upcoming Friday morning. The email and text response about the appointment that i set was excellent. The technician notified me he was on the way and promptly arrived at 8am. His name is Greg, and he is very knowledgeable about boilers and his craft. He was able to correctly identify our immediate trouble and let me know he could have the unit back up and running the same day. He also let me know about other details that should be upgraded. So, we are very happy that Greg came to our home and checked out the boiler. We will be very happy to have them back in the future."
Additional Photos
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+24

10 neighbors recently requested a quote
Recommended by81%of homeowners
Avatar for Aether Mechanical, LLC
Aether Mechanical, LLC
4.5(
106
)
Gas Boiler or Radiator Heating System - Install

Serving Longmont, CO and surrounding areas

Approved

In business since 2020

Free estimates

Emergency services offered

"Highest recommendation for the Aether Mechanical team for our recent boiler replacement--every detail of the experience was managed professionally and expeditiously, and the entire project was completed in one day. Take a bow Nicholas, Ivan, John, and team--virtuoso performance and a first-rate result! Two days after Christmas we woke up to a cold house and a boiler that would not fire up. Aether Mechanical responded at once by phone and Nicholas arrived onsite from Boulder to our house in SE Denver within two hours. Initial assessment indicated a burnt-out igniter. Nicholas replaced that and discovered during fire-up testing that carbon monoxide levels were *way* above acceptable limits. After repeated tests, the unavoidable conclusion was a cracked firebox, necessitating replacement. We reviewed estimates at three price points, selected one, and Nicholas mobilized his team. During a holiday week, working around challenges with HVAC supply house business hours, the team completed the installation entirely the following day. In spite of an expensive but necessary replacement, this has been singularly the best contractor experience I have had in 25 years living in a mid-century modern house that is starting to require more frequent repairs."
Mini-Split system
AC/Furnace Install
Cast Iron Boiler
AC Install
Boiler

+1

Response time7 hrs
Response rate89%
80 neighbors recently requested a quote
Avatar for Jim Needham Heating Cooling Plumbing & Drain
Jim Needham Heating Cooling Plumbing & Drain
4.5(
72
)
Gas Boiler or Radiator Heating System - Install

Serving Longmont, CO and surrounding areas

Approved

In business since 2018

Free estimates

Emergency services offered

"I Had 5 different bids on my bathtub and shower projects, Jim Needham was the most professional company I dealt with. Pricing is a concern ,and he came up with an amount I could work with. I am looking forward to having them install my products and I like the fact they are an actual plumbing company!!"
After
Furnace
Outdoor a/c (condensing) unit
Indoor furnace
Outdoor a/c (condensing) unit

+1

Response time2 days
19 neighbors recently requested a quote
Recommended by89%of homeowners
Avatar for Controlling Systems
Controlling Systems
4.4(
14
)
Boiler or Radiator Heating System - Install or ReplaceElectric Boiler or Radiator Heating System - InstallGas Boiler or Radiator Heating System - Install+3 more

Serving Longmont, CO and surrounding areas

Approved

In business since 1976

Free estimates

Emergency services offered

"Every step, from the estimate with the super friendly Ryan, to the final walk-thru with the always professional Gemini, was absolutely top notch. They installed a new furnace, A/C, and tankless water heater and we are very happy with the work and final outcome. The whole crew was wonderful!"
Additional Photos
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8 neighbors recently requested a quote
Recommended by76%of homeowners
Avatar for Allen Construction
Allen Construction
4.9(
24
)
Electric Boiler or Radiator Heating System - Install

Serving Longmont, CO and surrounding areas

Approved

In business since 2005

Free estimates

Credit card accepted

"10/10 experience. installed a load-bearing beam and currently demoing our bathroom for to start our bathroom remodeling, and the results were amazing. Very professional, reliable, and detail-oriented. Everything was completed on time and the quality of work was excellent. Highly recommend! He also walked me thru and design my kitchen lay out"
Owen Allen
House remodel
House remodel
House remodel
House remodel

+30

Recommended by82%of homeowners
Avatar for Tipping Hat  Plumbing Heating & Electric, LLC
Tipping Hat Plumbing Heating & Electric, LLC
4.0(
436
)
Gas Boiler or Radiator Heating System - InstallOil Boiler or Radiator Heating System - Install

Serving Longmont, CO and surrounding areas

Approved (Corporate)

In business since 2000

Free estimates

Credit card accepted

"Like any plumbing job today, the cost of installation is rough two or three times the cost of the item. This is a product of shortages of skilled help and there is little to be done. If you want it done particularly with any speed you will pay these prices. The cost of a water heater installed is three times what it was only ten years ago."
Smart Tstat
High Efficiency Furnace
Humidifier
Standard Furnace
Furnace, Water heater and Air purifier

+16

Response time10 hrs
194 neighbors recently requested a quote
Recommended by85%of homeowners
Avatar for SWAN Plumbing, Heating & Air of Loveland
SWAN Plumbing, Heating & Air of Loveland
5.0(
3
)
Gas Boiler or Radiator Heating System - Install

Serving Longmont, CO and surrounding areas

Approved

In business since 2006

Free estimates

Emergency services offered

Our team of master plumbing, heating and air conditioning technicians are dedicated to providing professional quality plumbing and HVAC services to residents and families throughout the Denver metro area. Our teams of highly qualified plumbers and technicians are always equipped with stocked work trucks to get the job done and resolve your issues quickly. We understand the importance of providing timely and high quality service. Being a family-owned and operated business, we are also mindful of the fact that it is taking place within your home, and take the following steps to respect your home while we are on-site \n

AC Repair
HVAC Service
Furnace Service
Ac Repair
Air Conditioning Services

+1

Response time2 days
Response rate100%
26 neighbors recently requested a quote
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Install Boiler FAQs, answered by experts

Coolant and antifreeze are technically not the same thing. The difference between the two is the ratio of water to other chemicals. True antifreeze is mainly made up of either ethylene glycol or propylene glycol, while coolant comprises one part antifreeze and one part water. However, the terms coolant and antifreeze are often used interchangeably, even by pros.

Most home boilers will need an expansion tank. That’s because these boilers are closed-loop systems, where the water is trapped. An expansion tank is needed when the boiler heats the water and it expands, allowing air to condense in the tank to make room for the water. Other types of boilers don’t use an expansion tank, such as traditional steam boilers, but these aren’t as common. And hot water tanks may be able to use a pressure release valve instead. When in doubt, call in a pro to take a look.

Most installations take 2-5 days, including old system removal and setup.

The best time to buy home heating oil is in the summer when the demand is lowest, as the prices are usually lower. However, waiting until the summer to buy is often unavoidable unless you install a separate storage tank. If you have the space for a second tank, you can expect to pay between $1,000 and $4,000 for the oil tank replacement or installation, depending on the capacity and location. You could quickly recuperate these costs, though, by stocking up on heating oil in the summer and avoiding deliveries in the winter when prices are highest.

DIY is not recommended due to safety risks and technical expertise required. Hire licensed professionals.

The Longmont, CO homeowners’ guide to boiler installation services

From average costs to expert advice, get all the answers you need to get your job done.