Our story is simple. Our experience is deep.

Perfect Temp is a locally owned and operated heating and cooling company in Bozeman. When you call, you work directly with the owner.

or call (406) 595-6260

Meet Corey Waller

Founder and owner. Licensed Professional Engineer.

With 25 years of mechanical engineering experience and 16 years as a licensed Professional Engineer, Corey Waller founded Perfect Temp in 2023 to serve Bozeman and the surrounding communities.

Corey's interest in how things work started early. He enjoys solving problems and finding the best way to fix them, which led him to engineering and to his career. Today that means he can diagnose a problem quickly and find the right solution.

Corey and his family love living in Bozeman. The warmth and friendliness of the community, and the camping, hiking, skiing and trail riding with family and friends, energize both his personal life and his work.

His customers include friends, neighbors and business owners. Perfect Temp is built on respect, with the customer first. Because you work directly with the owner, the person on your job knows your system deeply. That saves time, and money.

On the job

A Perfect Temp technician in an attic beside a unit raised on a lift — Up in an attic, with the unit on a lift.

A Perfect Temp technician working on a unit by flashlight — Working on a unit by flashlight.

A York furnace fitted in a utility closet — A York furnace in a utility closet.

A blower assembly with its control wiring laid out for repair — A blower assembly and its wiring, opened up.

The black Perfect Temp van parked below snow-capped peaks — The Perfect Temp van.

The black Perfect Temp van under a big evening sky — The van under an evening sky.

The back of the Perfect Temp van with the phone number across the top — The number on the back: (406) 595-6260.

Our core values

Core values are more than words on a wall at Perfect Temp. They shape how we treat customers, vendors and each other.

Transparency

We are open and honest with each other and our customers, communicate proactively, and welcome accountability.

Customer commitment

We deliver value by meeting each customer's needs promptly and personally, with quality and respect.

Gratitude

We appreciate our customers and are thankful for the opportunity to serve our community.

Hard work

We are dedicated to doing the job right every time, and we keep at a problem until it is solved quickly, efficiently and effectively.

Continuous learning

We will never stop learning to do our trade better, and we are committed to teaching customers how to care for their heating and cooling investment.

Working with Corey

5.0 from 11 Google reviews

Read all 11 reviews

Todd S.

July 2026

I have worked with Corey for years and have been very happy with his work and work ethic. He care about what he does and does great work. I would highly recommend him.

Dane B.

September 2023

Corey was awesome. He was fast, professional, and thorough during the whole process. When problems arose, he always sought me out and let me know all of my options so I could make an informed choice before proceeding. I am more than pleased with Perfect Temp and my choice to use them on my project.

Joshua T.

April 2025

Corey is awesome! The team at Perfect Temp has always treated me fair and kind.

Why your neighbors choose Perfect Temp

24/7 emergency service
Repair and engineering expertise
Long-term solutions over temporary fixes
Service tailored to your needs
Responsive care
Local, family-owned business
One-year labor warranty
5% off for retired and military personnel

A boiler room before the work, with an older boiler and exposed piping — **Before.** A boiler room.

The finished boiler room, with a new boiler, copper piping and manifolds — **After.** The finished boiler room.

Questions about your system?

Claim 10% off your first service. Retired and military personnel get 5% off, and every job carries a one-year labor warranty.

or call (406) 595-6260