Breathe Easier at Home and at Work

The air inside your home or business can contain dust, allergens, pollutants, and humidity imbalances that affect your health, comfort, and even your HVAC equipment's efficiency. Most people spend the majority of their time indoors — making indoor air quality one of the most important factors in overall well-being.

Markl & Sons offers a full suite of indoor air quality solutions, from advanced air purification systems to smart thermostats and zoned comfort control, all designed to integrate seamlessly with your existing heating and cooling equipment. Our experienced technicians serve residential and commercial customers throughout Denison, TX and surrounding areas.

Air Purification Systems

Whole-home and commercial air purification systems remove airborne contaminants that standard HVAC filters miss — including bacteria, mold spores, pet dander, volatile organic compounds (VOCs), and fine particulate matter. Markl & Sons installs and services purification systems that mount directly into your existing ductwork, requiring no separate equipment or major renovation.

• Reduces allergens and airborne pathogens for healthier indoor air
• Compatible with most existing forced-air heating and cooling systems
• Works continuously without manual filter changes in many configurations
• Helps control odors from cooking, pets, and building materials
• Available for both residential and light commercial applications

Programmable & Smart Thermostats

Upgrading to a programmable or smart thermostat is one of the fastest ways to reduce energy costs and improve comfort. Instead of running your HVAC system at full capacity all day, smart thermostats learn your schedule, adjust temperatures automatically, and give you remote control from any smartphone or device.

• Set heating and cooling schedules by time of day and day of week
• Reduce energy consumption when the home or building is unoccupied
• Remote access and adjustment from any internet-connected device
• Compatible with most modern heating and cooling systems
• Professional installation and setup by Markl & Sons technicians

Zoned Comfort Control

A zoned HVAC system divides your home or commercial space into separate temperature zones, each controlled independently. This eliminates hot and cold spots, stops energy waste in unoccupied areas, and lets every person in the building set the temperature they prefer — without affecting other rooms.

How Zoning Works: Dampers installed inside your ductwork open and close in response to individual zone thermostats. A central controller coordinates all zones, directing conditioned air only where it's needed. Markl & Sons designs and installs complete zoning systems for new and existing construction — including retrofits on standard single-zone forced-air systems.

• Eliminate uncomfortable temperature differences between rooms or floors
• Reduce energy bills by conditioning only occupied areas
• Customize comfort for bedrooms, offices, server rooms, and more
• Compatible with most existing ductwork and HVAC equipment
• Ideal for multi-story homes, additions, and open-plan commercial spaces

Professional Coil Cleaning

Dirty evaporator and condenser coils are one of the leading causes of poor indoor air quality, reduced cooling capacity, and high energy bills. When coils collect dust, mold, and debris, your system works harder, costs more to operate, and circulates contaminated air throughout your home or building.

Markl & Sons provides professional coil cleaning as a standalone service and as part of our preventive maintenance agreements. Regular coil cleaning restores heat-transfer efficiency, reduces strain on the compressor, and significantly improves the air that circulates through your system.

• Restores system efficiency and reduces monthly energy costs
• Eliminates mold, bacteria, and debris circulating through ductwork
• Extends the service life of your HVAC equipment
• Reduces the risk of costly compressor failures
• Recommended annually for most residential and commercial systems