J&J Mechanical

J&J Mechanical Proudly serving Dane, Green and Rock counties, J&J Mechanical delivers dependable, high quality residential and commercial HVAC services you can trust.

Whether a fast repair, full system installation, or routine maintenance, our team is here for you.

Does your outdoor A/C condenser look like this? We hope not, but if it does, call us for a clean and check.J&J Mechanica...
06/23/2026

Does your outdoor A/C condenser look like this? We hope not, but if it does, call us for a clean and check.

J&J Mechanical
608-558-3361

Finished up our industrial duct install job.
06/14/2026

Finished up our industrial duct install job.

Another satisfied customer! We take pride in delivering quality workmanship, reliable service, and results you can count...
06/09/2026

Another satisfied customer! We take pride in delivering quality workmanship, reliable service, and results you can count on. Thank you for trusting us with your HVAC needs!

Retrofit an existing duct run to accommodate a new piece of equipment.
06/08/2026

Retrofit an existing duct run to accommodate a new piece of equipment.

New construction home. In-floor tubing installed for heated concrete. Pressure tested and ready to pour concrete!
06/04/2026

New construction home. In-floor tubing installed for heated concrete. Pressure tested and ready to pour concrete!

Summer temperatures are climbing fast! Now is the perfect time for:✔️ AC Tune-Ups $130.00✔️ Repairs✔️ New System Install...
05/30/2026

Summer temperatures are climbing fast!

Now is the perfect time for:
✔️ AC Tune-Ups $130.00
✔️ Repairs
✔️ New System Installations

Stay cool and comfortable — message us today!

We service Dane, Green, and Rock counties.

J&J Mechanical Inc.
608-558-3361
608-867-6070

05/28/2026

Installing a custom duct run.

In-between servicing and replacing air conditioners this spring, we also offer duct alternations for residential, indust...
05/26/2026

In-between servicing and replacing air conditioners this spring, we also offer duct alternations for residential, industrial, and commercial properties.

Pictures attached are from a job we started last week.

Out with the old, in with the new. One down, two to go. 7.5 million BTUs in total.
05/15/2026

Out with the old, in with the new. One down, two to go. 7.5 million BTUs in total.

In-floor heat for two separate homes, both using combi boilers.Owner Jim Jaeggi in his element!
04/09/2026

In-floor heat for two separate homes, both using combi boilers.

Owner Jim Jaeggi in his element!

Address

3369 8th 1/2 Street
Monroe, WI
53566

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