Heating • Cooling • Indoor Air Quality

Metro Detroit heating and cooling, backed by generations of local service.

Otto A. Trzos Co., Inc. helps homeowners repair, maintain and replace furnaces, air conditioners, boilers, water heaters and indoor air quality equipment throughout Metro Detroit and nearby Oakland County communities.

Get a Free Quote Call (248) 682-3100

1940s heating and cooling contractor beside a vintage service truck

Heating and cooling help(248) 682-3100

Michigan family returning to a warm home during winter

Heating & Cooling

Furnaces, air conditioners, boilers, heat pumps and whole-home comfort solutions.

Family enjoying clean comfortable air in a bright living room

Indoor Air Quality

Air cleaners, filters, humidifiers, air scrubbers and better household airflow.

Professional HVAC technician ready to help a homeowner

Book a Call or Quote

Call directly or send the service form with your city, system and preferred timeframe.

Otto A. Trzos family HVAC service van in Metro Detroit

Let our family help your family.Three generations of local HVAC service built around practical advice, careful work and long-term home comfort.

A family HVAC company

Local roots. Straight answers. Comfortable homes.

The company has served southeastern Michigan since 1945. Today, homeowners can call for service, request a replacement estimate, ask about indoor air quality or plan maintenance before the next weather extreme.

Home comfort advisor checking a residential thermostat

Personal HVAC guidance

Understand the repair, maintenance and replacement choices before deciding.

Technician diagnosing an outdoor air conditioning unit

Repair, maintenance and replacement

Support for no-heat calls, cooling problems, seasonal care and full-system updates.

Family living comfortably in a bright well-conditioned home

Comfort beyond the equipment

Airflow, humidity, filtration, controls and room-to-room temperature all matter.

Heating and cooling services

Everything your home needs to stay comfortable.

From a furnace that will not start to an air conditioner that cannot keep up, the first step is understanding what the system and the home are actually doing.

Residential radiator and hydronic heating controls for furnace and boiler service

Furnace, Boiler & Heating Service

Diagnosis, seasonal maintenance, boiler service and replacement planning for dependable winter heat.

Request heating service →

HVAC technician checking pressures and diagnosing residential cooling equipment

Air Conditioning Service

Help for warm rooms, no-cool calls, short cycling, water leaks, airflow problems and replacement estimates.

Call for AC service →

Multi-generational family enjoying balanced temperature and cleaner indoor air

Indoor Air Quality & Humidity

Whole-home filtration, humidification, air scrubbing, thermostat controls and practical airflow improvements.

Explore comfort products →

Replacement planning

Need a new furnace, AC, boiler or water heater?

Get a practical estimate that considers equipment size, efficiency, venting, electrical needs, airflow, humidity and the way your family actually uses the home.

Call (248) 682-3100 Get a Quote

Homeowners comparing HVAC replacement and energy-saving options

Home comfort products

Equipment selected around your home, not just a model number.

Every product category connects to a real comfort goal: warmer winter rooms, better summer humidity control, cleaner air, quieter operation or easier temperature management.

Technician servicing a central air conditioning condenser outside a home

Air Conditioners

Efficient cooling with better moisture removal.

Technician servicing a residential furnace in a basement utility area

Furnaces

Reliable heat, quieter operation and staged comfort.

Technician inspecting a residential boiler with copper piping

Boilers

Hydronic heat, zones and radiant comfort options.

Technician servicing a residential water heater

Water Heaters

Tank and tankless replacement planning.

HVAC professional reviewing whole-home air filtration with a homeowner

Air Cleaners

Whole-home filtration for everyday indoor air.

Technician inspecting a whole-home humidifier connected to ductwork

Humidifiers

Bypass, fan-powered and steam humidity support.

Homeowner adjusting a smart thermostat inside a bright home

Thermostats

Simple controls, scheduling and connected options.

Technician replacing a residential HVAC air filter

Filters & Media

Furnace filters and humidifier replacement media.

How it works

A simple path from a comfort problem to a clear next step.

Homeowner adjusting a thermostat before calling for heating or cooling help

Tell us what is happening

Call or send the form with the city, system, symptoms and preferred timeframe.

Technician inspecting a home air return and filtration area with a homeowner

Inspect the system

Review equipment operation, safety, controls, airflow and the surrounding installation.

HVAC advisor reviewing repair and replacement options with homeowners

Review the options

Compare repair, maintenance and replacement paths with practical cost and comfort context.

Family enjoying a comfortable home after HVAC service

Restore comfort

Schedule the work and know what to expect from the system afterward.

Planning resources

Financing, energy savings and seasonal offers.

A new system is a major home decision. These resources help families plan the project and understand potential ways to manage the cost.

Financing

Ask about Michigan Saves financing. Contractor ID: 100257. Code: 9269.

Homeowners discussing HVAC rebates and project planning with an advisor

Rebates & Tax Credits

Review current incentive possibilities for qualifying high-efficiency equipment before choosing a system.

Home comfort advisor helping a homeowner plan seasonal service

Seasonal Offers

Ask about available service, maintenance and replacement promotions when you call or request a quote.

Homeowner advice

Latest heating and cooling guides.

Practical answers for Metro Detroit homeowners planning repairs, maintenance and replacement decisions.

HVAC Advice

How to Prepare Your HVAC System for Metro Detroit Weather Swings

The best preparation is testing equipment before extreme weather arrives, keeping filters and outdoor units clear, managing humidity and scheduling service when the system starts behaving differently—not after it stops completely.

Read the guide →

HVAC Advice

What Size Furnace or Air Conditioner Does My House Need?

The right HVAC size depends on the home’s heat loss and heat gain, not just square footage. Insulation, windows, orientation, air leakage, ductwork, occupancy and design temperatures all influence capacity.

Read the guide →

HVAC Advice

Smart Thermostats: What They Can—and Cannot—Fix in Your Home

A smart thermostat can improve scheduling, remote access and control features, but it cannot correct undersized ductwork, failing equipment, poor insulation or a badly sized HVAC system.

Read the guide →

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Local service areas

Furnace and air conditioning service across Metro Detroit.

Explore local service information for communities throughout Metro Detroit. Each page answers common HVAC questions for that community and links directly to a quote request.