Find and Invite the Best Commercial HVAC Contractors in Janesville, WI
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15 Best HVAC contractors in Janesville, WI
Downtobid vets each subcontractor's specialties, capabilities, and contact details for complete accuracy.
Complete Mechanical Solutions
P.O. Box 518 Rockton, IL 61072
Complete Mechanical Solutions is an HVAC contractor located in Machesney Park, IL, offering commercial and residential heating, cooling, industrial ventilation services, and 24/7 emergency services with free estimates and warranties available.
Verified
Specializations (1)
Office Building
Fleming Heating & Air Conditioning
South Beloit, IL 61080
Fleming Heating & Air Conditioning Inc. is a provider of high-quality HVAC services in South Beloit and Belvidere, offering a range of services including installation, repair, and maintenance of heating and cooling systems since 1964. They are recognized as a Lennox Premier Dealer and have received the Lennox Industries Years of Partnership Award.
Verified
Specializations (3)
Federal Government
Government
Office Building
Klecker's Heating & A/C
1221 W. Main St. Watertown, WI 53094
Klecker's Heating & A/C, Inc. is a professional heating and air conditioning service provider that has been operating since 1979, offering a range of HVAC services including sales, service, replacement, repair, and emergency 24-hour service in Dodge County, Jefferson County, Waukesha County, and surrounding areas in Wisconsin.
Verified
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Air Temperature Services
5301 Voges Rd, Madison, WI 53718
Air Temperature Services, Inc. is a Wisconsin-owned HVAC contractor with 35 years of experience specializing in the design, installation, maintenance, and service of commercial and industrial heating, ventilation, air conditioning, and refrigeration (HVACR) equipment, serving Southern Wisconsin and the broader Midwest region.
Verified
Southern Lakes Plumbing & Heating
N5860 U.S. Hwy. 12 Elkhorn, WI 53121
Southern Lakes Plumbing & Heating, established in 1983 in Elkhorn, WI, provides commercial and residential plumbing, heating, and cooling services in the Greater Walworth County Region, aiming to develop long-term customer relationships through quality work and trusted tradesmen.
Verified
Janesville Plumbing
4101 Commercial Dr. Janesville, WI 53545
Janesville Plumbing is a full-service plumbing contractor based in Rock County, Wisconsin, specializing in residential, commercial, and new construction plumbing services, including repairs, installations, and remodeling since 2000.
Verified
Greiber Heating & Sheet Metal
402 W. Main St. Waunakee, WI 53597
Greiber Heating & Sheet Metal is a fourth-generation, family-owned business providing premier residential heating and cooling services in Waunakee and the surrounding Dane County area since 1945. As an award-winning Carrier supplier, they offer personalized service, custom HVAC solutions, and a commitment to quality with 24-hour emergency services.
Verified
High reply rate
Active contractor

Miller Engineering
1616 S Main St, Rockford, IL 61102
Miller Engineering is here to support your remodeling and new construction needs across residential, commercial, and industrial projects in Rockford and the surrounding areas.
Verified
Active contractor
Modern Heating & Cooling
10050 U.S. Hwy. 14 Black Earth, WI 53515
Modern Heating & Cooling is a professional HVAC company based in Black Earth, Wisconsin, offering a wide range of services including installation, replacement, and repair of heating and cooling systems for residential and light commercial applications. Established in 1985, the company provides 24/7 emergency services and specializes in air purification, geothermal solutions, and hydronics, serving Madison, WI, and surrounding counties.
Verified
High reply rate
Active contractor
Air Systems
4520 County Hwy. F, N. P.O. Box 522 Delavan, WI 53115
Air Systems Inc. is a family-owned and operated business specializing in heating, plumbing, and drain cleaning services, with over 30 years of experience in the industry, serving the Walworth, Jefferson, and Waukesha Counties and surrounding areas since 1991.
Verified
R&W Heating & Cooling
Milton, WI 53563
R&W Heating & Cooling, Inc. is a local HVAC service provider in Milton, WI, offering a wide range of heating and cooling services including repair, installation, and maintenance for residential and commercial clients since 1960.
Verified
Specializations (2)
Healthcare
Museum

J.M. Brennan
6430 Ronald Reagan Ave, Madison, WI 53704
J.M. Brennan, Inc., established in 1932 and based in Milwaukee, WI, is a full-service mechanical contractor serving Southeastern Wisconsin with expertise in HVAC, plumbing, process piping, controls, industrial sheet metal, and 24/7 emergency service.
Verified
Specializations (13)
Correctional
Education
Federal Government
Financial
Capitol Mechanical
3444 Capitol Dr. Sun Prairie, WI 53590
Capitol Mechanical is a commercial HVAC design and build contractor that has been providing high-quality, energy-efficient, and sustainable solutions since 1971, with services including sales, service, maintenance, and building automation.
Verified
Maass Refrigeration Service
1221 W. Main St. Watertown, WI 53094
Maass Refrigeration Service, LLC is a dependable company specializing in the sales, service, installation, and repair of commercial and industrial refrigeration and HVAC equipment, offering service contracts and maintenance agreements to ensure optimal equipment performance.
Verified
Active contractor
Adams
503A Nathan Ln. Elkhorn, WI 53121
Adams is a family-owned and operated company since 1988, providing a wide array of services including electrical, generators, smart home technology, heating & cooling, solar, and plumbing solutions to families and businesses in Wisconsin and Northern Illinois. They are known for their 24/7 emergency service, customized solutions, and a commitment to safety, professionalism, and lifelong support.
Verified
Good to know insights about HVAC contractors in Janesville, WI
Bidding difficulty
High
Average response time
3 days
Average interest distance
56 miles
Average lead time to bid
15 days
How far are HVAC contractors in Janesville, WI willing to travel?
Every trade and region has difference sensitivity to distance. We grouped distances into 4 categories to help you understand the distribution of 24 bid packages. The ratios of bidding contractors per distance group are 0%, 50%, 0%, and 0%.
How much lead time do HVAC contractors in Janesville, WI need to bid?
Every trade and region has difference sensitivity to due time. We grouped due times into 3 categories to help you understand the distribution of 14 bid packages. The ratios of bidding projects per due time group are NaN%, 38%, and 0%.
Commercial HVAC contractors insights in Janesville, WI
Explore 1484 verified HVAC contractors in Janesville, WI. Our platform analyzes real bidding activity, response times, and project preferences to help you make informed decisions. These insights are based on actual market data to streamline your contractor selection process.
Total contractors
1484 contractors
Total union contractors
168 union contractors
Total non-union contractors
973 non-union contractors
Total minority-owned businesses
33 minority-owned businesses
Total women-owned businesses
18 women-owned businesses
What certifications do HVAC contractors hold?
Professional certifications and licenses held by HVAC contractors in Janesville, WI, including OSHA safety training, trade-specific licenses, and manufacturer certifications required for specific project types.
What project types are HVAC contractors bidding on?
Project types that HVAC contractors in Janesville, WI are actively bidding on, including commercial office buildings, healthcare facilities, educational institutions, retail spaces, and industrial facilities.
What project owners are HVAC contractors bidding for?
Top general contractors and project owners that HVAC contractors in Janesville, WI are bidding for, showing which construction firms and developers are most active in the local market.
Save A Lot
Ford
Gap
Burlington
Four Seasons
Home Depot
Meijer
Milestones
Sears
HVAC projects insights in Janesville, WI
Explore 47 HVAC construction projects in Janesville, WI. Our analysis covers project sizes, building types, and market activity patterns to help contractors make strategic bidding decisions based on actual project data.
Total projects
47 projects
Average square footage
8,358 square feet
Maximum square footage
96,217 square feet
What square footage ranges are HVAC projects in?
Distribution of HVAC project sizes in Janesville, WI by square footage. Small projects include tenant improvements and retail spaces. Medium projects encompass commercial buildings and office spaces. Large projects represent major developments requiring significant resources and bonding capacity.
What construction sectors are HVAC projects in?
Building types and construction sectors for HVAC projects in Janesville, WI, including commercial office buildings, healthcare facilities, educational institutions, retail spaces, industrial facilities, and government projects.
Why Downtobid is the Go-To Platform for Contractors
"We have used Downtobid for our ITBs and so far our experience has been very positive. It has saved me time on the initial page turn and I really like the number of responses we're starting to see from our subcontractors!"
"The first time our company was able to travel outside Atlanta! Bidding in a new market and wasn't getting any hits on Drywall. Requested a boost and with 5 days I had 2 committed bidders and 1 submission. Using them on my next project."
"I love, the personalization of it. You get it more directed towards the contractors that we need. You make it a little more personal than putting it on Blue Book or Planhub or anything like that. You let us communicate with the subcontractors, so we can narrow it down from what you've already narrowed it down from. We get more detailed, correct quotes that we're looking for from you guys as opposed to maybe other places."
Why Downtobid is the Go-To Platform for Contractors
"We have used Downtobid for our ITBs and so far our experience has been very positive. It has saved me time on the initial page turn and I really like the number of responses we're starting to see from our subcontractors!"
"The first time our company was able to travel outside Atlanta! Bidding in a new market and wasn't getting any hits on Drywall. Requested a boost and with 5 days I had 2 committed bidders and 1 submission. Using them on my next project."
"I love, the personalization of it. You get it more directed towards the contractors that we need. You make it a little more personal than putting it on Blue Book or Planhub or anything like that. You let us communicate with the subcontractors, so we can narrow it down from what you've already narrowed it down from. We get more detailed, correct quotes that we're looking for from you guys as opposed to maybe other places."
FAQs
How can Downtobid help me find the best commercial HVAC contractors in Janesville, WI?
Downtobid helps you find the best HVAC contractors in Janesville, WI and submit bid requests for your projects. You provide project details, and the contractors respond with their bids through the platform.
Requesting bids from Janesville, WI-based HVAC contractors
You can invite a contractor directly through our platform. Visit the contractor’s profile and click ‘Invite to Bid.’ Fill out the project details, including scope, timeline, and specific needs. Contractors in Janesville, WI will then respond with their bids. It’s often helpful to call contractors after submitting a request, especially if your project is urgent.
Contractor verification process on Downtobid
Downtobid sets itself apart by verifying each contractor through a multi-step process. We use AI to ensure that contractor information, including trades, is accurate. We cross-check details using databases, public records, and Google Maps to confirm that businesses are active and their contact information is up-to-date before listing them.
Essential information for HVAC project bid requests
When submitting a bid request, include clear details about your project, such as materials needed, deadlines, and any specific requirements. The more specific you are, the better the contractor can assess and quote the job accurately.
Tips for contacting local HVAC professionals
If your project is urgent, it’s a good idea to call the contractor directly after submitting a bid request. This helps ensure they understand the timeline and scope of work, especially if immediate service is needed.
Managing bids for large-scale HVAC projects
If you have a larger project and don’t want to contact each contractor individually, you can reach out to us directly. We offer an ITB (Invitation to Bid) platform where you can manage bids from multiple contractors at once.
Expected response times from Janesville, WI contractors
Most HVAC contractors will respond within 24-48 hours, depending on the complexity of your request. However, response times may vary – so be sure to follow up!
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