Wisconsin has two seasons. We handle both.

What we do
Heat, cool, and the air in between.
Installs, repairs and seasonal maintenance on every brand.
HeatingFurnaces & boilers
Gas furnaces · Boilers · Heat pumps · In-floor heat · Garage heaters
Learn more about Furnaces & boilers
CoolingCentral AC & ductless
Central air · Ductless mini-splits · Multi-zone · Smart thermostats
Learn more about Central AC & ductless
Indoor air qualityAir that feels better
Humidifiers · Dehumidifiers · Purifiers · UV · Ventilation
Learn more about Air that feels betterQuick help
What's going on at your place?
Pick what you're dealing with. We'll tell you what to check first.
Why High Tech
Rated for Wisconsin.
Every furnace has a rating plate listing what it's built to handle. Here's ours.
Stocked trucks
Parts on board to finish most jobs in one visit.
Upfront pricing
You'll know the price before we start.
Insured & bonded
Above and beyond what's required.
Every brand
We sell Lennox, Daikin and Trane, and service them all.
RATING PLATE
HIGH TECH
SERIAL 608-221-8333
- Manufacturer
- High Tech Heating & A/C Inc.
- Established
- May 1986
- Location
- Cottage Grove, Wisconsin
- Customer rating
- 4.9 / 5.0 · 383 Google reviews
- Surveyed visits
- 3,398 since 2017
- Tech courtesy
- 96.6% five-star
- Service
- 24 hr emergency · all brands
- Service area
- Dane + Jefferson County
Reviews
383 Google reviews
Neighbors keep saying the same things: they called back fast, explained it clearly, and wore shoe covers.
Post-visit surveys since 2017
3,398
- Technician courtesy96.6% five-star
- Clean work area96% five-star
- Technician expertise95.3% five-star
“Sunday night went on the website and posted a service request. Received a call at 6:45am. By 7:30am Tech was in my basement and diagnosed the problem.”
“He explains things in a way that the customer understands, thank you Brian. I have the High Tech summer/winter contracts. They take the worry out of scheduling appointments.”
“I called High Tech right away for emergency service. Josh was there within 2 hours and repaired the system.”
“Called to tell time of arrival. Pleasant demeanor, wore shoe covers and completed maintenance service quickly.”
“Kyan was very knowledgeable. He explained a few things to me that helped me understand the cooling system. I highly recommend High Tech cause their service people are great.”
“My central air conditioner suddenly stopped working. They answered quickly, the technician arrived and was very professional. In less than 10 minutes he diagnosed the fault, replaced the damaged part and it was back up and running.”
“I absolutely love the ductless mini splits I had installed in my home. Your staff were very hard working and respectful. I would highly recommend!”
“Their technician George is very knowledgeable and does a great job of explaining everything. Their summer AC-winter heating system service plan is great value.”
High Tech Protection Plan
Protected by pros.
Two tune-ups a year, priority scheduling and instant savings. We'll call you when it's time.


Since May 1986
Started in a backyard. Still in the family.
Dave and Darci Bryan opened a heating shop out of their back yard. Forty years later it's a full crew in Cottage Grove, and the job hasn't changed.
1986
A backyard shop
Early ’90s
Into Jefferson County
1994
One roof in Cottage Grove
Today
Lennox, Daikin & Trane
Comfortable is a phone call away.
Repairs, tune-ups, or a no-pressure talk about a new system.
