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We Are Always Here For You High Velocity Conditioning System

High Velocity Conditioning System

Did you know you CAN have cooling with hot water heat?

Bay Heating & Air Conditioning Trucks

 Unico, Inc. is the leader in small duct heating and cooling systems and other high-end HVAC systems. The company manufactures all of its products in its modern125,000 square foot plant in St. Louis MO. The company is well known for extensive use in older, architecturally unique homes and buildings as well as elite, high end custom homes. The company is family-owned and operated and sells in all 50 United States, all provinces of Canada, and in over 28 countries around the world.

  • Air is distributed through small 2-inch flexible ducts that fit almost anywhere.
  • Aspirating the stagnant room air with small jets of air eliminates drafts and hot/cold spots.
  • The ductwork is optimized for low noise – no more popping and banging of the duct.
  • Increased moisture removal during cooling. Our coils are designed specifically to remove significantly more humidity for a drier home during cooling.
  • Unico heat pump systems are truly warm air systems – no more “cold blow”. A Unico system delivers the air at substantially higher temperatures than a conventional system.
  • The Unico system has flexible mini-ducts that weave easily through existing construction.

Family Owned & Operated Since 1944

When you need a company you can trust, you need Bay Furnace.

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View up to date SpacePak High Velocity Conditioning System information.

Membership Savings Bay Comfort Promise Priority service, annual maintenance, and exclusive savings for year-round comfort.

• Priority scheduling when you need it most • Annual system tune-ups to keep your equipment running efficiently • Exclusive member discounts on repairs and services

The Word Around Town Hot Reviews. Cool Service.

    Convenient to schedule and arrive on time
    “Great group of guys that have solved my problems so far without trying to cut corners and make an easy buck! Convenient to schedule and arrive on time!”
    - Ryan A.
    Cleaned up the work area as if they were never there
    “Bay furnace installed a whole house humidifier in March. The crew was very polite, professional and cleaned up the work area as if they were never there. I definitely would recommend them.”
    - Diana G.
    Our basement was cleaner than when they arrived
    “Yesterday we had our furnace replaced. The service people were warm and friendly. They explained everything to us. They explained the thermostat until I understood It. They cleaned up so much that our basement was cleaner than when they arrived. I highly recommend them.”
    - Nancy B.
    Everything you'd wish your other service professionals were
    “Highly recommend this company; HONEST, prompt, clean, considerate! Everything you'd wish your other service professionals were. Great job!”
    - B.J.
    Always does a great job and is friendly and kind
    “Love José and Bay Furnace! He always does a great job and is friendly and kind. We always ask for him. Will continue to use them in the future.”
    - Katie B.
    Our new A/C is awesome
    “Excellent service. Installers were very friendly and knowledgeable. Our new A/C is awesome. Thanks Bay Heating and Cooling.”
    - Brian S.
    This kind of workmanship is hard to find these days
    “I'm very happy with the furnace/AC replacement project carried out by Paul, Johnny and Jerry. Top rated! This kind of workmanship is hard to find these days. It comes down to the people who put the system in the house. We pay a little more but we got a team who stayed with Bay furnace for 20+ years, who took pride in their finished product.”
    - Zhiqiang G.
    Professional, knowledgeable and friendly
    “Jose is the absolute best! He is professional, knowledgeable and friendly. Thank you Bay Heating & Air Conditioning and Jose!”
    - Amanda P.
    We were so impressed
    “The entire experience with Bay HVAC was great, from the initial phone call to the professional and expert service provided by the technician, Brian. We were so impressed that following the service call we enrolled in Bay's membership program.”
    - Ed W.
  • Carrier Factory Authorized Dealer
    Carrier Factory Authorized Dealer
    Bay Heating & Air Conditioning is proud to be a Carrier Factory Authorized Dealer, a distinction earned by meeting Carrier’s highest standards for technical expertise, customer satisfaction, and ongoing training. This designation ensures your system is installed and serviced to strict manufacturer specifications for long term performance and reliability.
  • Carrier President’s Award
    Carrier President’s Award
    The Carrier President’s Award is one of the highest honors a Carrier dealer can receive. This award recognizes Bay Heating & Air Conditioning for excellence in leadership, customer satisfaction, quality installation, and overall business performance, reflecting their commitment to delivering superior comfort and service to every homeowner.

Bringing 75 Years Of Experience To Every Job Schedule Service with Confidence

Whether you need repairs, maintenance, or a new system installation, our team is here to provide dependable solutions backed by decades of experience. Tell us how we can help and we’ll take it from there.

  • By submitting, you agree to receive text messages from Bay Heating & Air Conditioning at the number provided, including those related to your inquiry, follow-ups, and review requests, via automated technology. Consent is not a condition of purchase. Msg & data rates may apply. Msg frequency may vary. Reply STOP to cancel or HELP for assistance. Acceptable Use Policy

WHY HOMEOWNERS CHOOSE Us Comfort Done Right

Award-winning service backed by warranties, expertise, and a commitment to your comfort.
  • The Bay Comfort Promise
    We are committed to our customers. We aren't done with a job until you are comfortable, guaranteed.
  • Family Owned & Operated
    As a family-owned business we understand the importance of quality in your home and we'll take care of yours as if it was our own.
  • Warranties That Matter
    We provide a thirty-day warranty on all repairs completed and a one-year labor warranty on all new installs.
  • Expert Technicians
    We are mindful in who we hire to ensure you are getting the very best work every time.
  • One Stop Shop
    We are a full service company so we guarantee everything done is completed with the highest standard.
  • 75 Years Experience
    We've been in business since 1944 and we're bringing that experience to every job completed.