Ariston (Adj) - derived from the Greek word (Αρίστoν) meaning "the best, excellence"

We are a local, family owned, licensed, insured and bonded C20 contractor and Lamorinda locals since 1988. We lovingly serve the Lamorinda area, Diablo Valley, Oakland-Berkeley corridors as well as points beyond. We value and maintain exclusive, long-term partnerships in order to consistently provide and install quality heating and cooling systems, year after year. Ariston is an ethos, to simply treat every project and every customer as friends & family. Using only premium-grade products and materials, we schedule all projects with open end dates so there is never any rush; each job is truly custom-tailored, and never finished until you are 100% satisfied.

As an authorized American Standard dealer and Mitsubishi Diamond Contractor we specialize in smart home, integrated high-efficiency heat pump/air handler upgrades, furnaces, hybrid & dual-fuel solar-optimized systems, air conditioners, ducting & indoor air quality; this also includes single- and multi-zone ductless mini splits.

Let us show you how to increase property value, decrease utility bills [to increase profit], and elevate comfort, convenience, and wellness to a new level... never a charge for consults. Ariston, the Definition of Excellence!


Existing Furnace or AC Fail?

Factory-trained technicians to repair or upgrade your existing system


Fed Up With $$$ Utility Bills?

High efficiency mini split upgrade options that begin saving you money immediately


Ready To Upgrade Your Standard Of Living?

Enjoy truly modern comfort, convenience, and Indoor Air Quality

We Earned the Diamond Certified Award!

98% Approval Rating based on an independent, random sample of over 400 past customers.

3D House Illustration for Shades of Comfort

Go Full Electric with Our Ducted and/or Ductless Heat Pump Options

Certified Mitsubishi Diamond Contractor.

  • Ductless multi-zone systems 30% more efficient vs. conventional systems.
  • Full variable inverter driven compressors.
  • No more high gas bills!

State of the Art Convential HVAC Systems

American Standard Authorized Dealer

  • Rated one of the top brands for reliability by consumer reports
  • Patented, Duration Compressors designed to last a lifetime
  • Patented Spine Fin Coil for Optimal Air Conditioning Efficiency

Personal Attention

  • Family Owned and Locally Operated Serving the East Bay
  • Every project custom-designed
  • Satisfaction and Workmanship always guaranteed
  • References Available Upon Request
  • Pet Friendly


Mi-BEST logo

Designers and Builders - We are full service from sketch to final inspection

Specializing in high efficiency and ZNE remodels and new construction, and advanced home automation projects - contact us for access to Portfolio links

Proudly Certified Mi-BEST A+ in all Residential and Lite Commercial Title 24 for 2020 -beyond

-Advanced Building Envelope and Duct Design

-Airflow and Static Pressures

-Refrigerant Charge Dynamics

-Building Ventilation

-Quality Insulation Installation - QII

Don't Wait, Schedule a Free In-home Consultation Now!

Start living happier and healthier, and stop overpaying for comfort RIGHT NOW - we'll show you how easy and affordable it can be. Credit cards accepted.

We lovingly serve
Lamorinda, the Diablo Valley, Oakland-Brentwood Corridors and points beyond!