We're Not


Until You Are

The weather is always comfortable inside your home, thanks to Design-Air Heating and Air Conditioning.

happy husband and wife in kitchen living in the comfort of their home Monticello, Illinois

Licensed Heating & Air Conditioning Technicians
Monticello Illinois

Since 1977, Design-Air Heating & Air Conditioning has stood as a cornerstone of HVAC expertise in Monticello, IL, and its neighboring areas. Our comprehensive range of HVAC services covers everything from maintaining and repairing air conditioning systems to diagnosing and replacing furnaces, cementing our reputation for top-tier quality and reliability.

Staffed with NATE-certified technicians, our team ensures expertise in servicing a diverse array of HVAC models from trusted brands. Whether you need an AC filter replacement or an assessment of your home’s air quality, rely on us for tailored, comprehensive solutions.

As a family-owned business, we prioritize the safety and comfort of your home. Contact us today for a personalized estimate from our skilled technicians and discover the pinnacle of HVAC excellence for your home.

Air Conditioning Services
Monticello Illinois

When an air conditioning issue compromises your home’s cooling, trust Design-Air Heating & Air Conditioning in Monticello, IL, for exceptional AC repair, maintenance, and installation services. Our team consists of NATE-certified technicians well-versed in various AC models from renowned brands.

Whether it’s routine maintenance or the need for a new AC system, our experts are committed to pinpointing the most cost-effective and dependable solutions for your cooling needs. Reach out to us for estimates on AC replacement services and immediate repair scheduling at 217.429.1105. Count on our professional expertise to restore your home’s cooling efficiency.

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Furnace Services
Monticello Illinois

As winter sets in Monticello, IL, ensuring your home stays warm with a reliable furnace becomes crucial. If you encounter problems like a faulty pilot light or your furnace emitting cold air, trust Design-Air Heating & Air Conditioning for prompt assistance. A family-owned business, we specialize in residential furnace repair, maintenance, and installation for various reputable brands.

Our team of NATE-certified technicians performs thorough assessments to pinpoint furnace issues and provides dependable repairs to restore your home’s warmth. Don’t suffer in the cold—reach out to us for swift solutions.

Indoor Air Treatment
Monticello Illinois

As contemporary building structures prioritize security and efficiency, ensuring excellent indoor air quality is increasingly crucial for homes and businesses. With over four decades of expertise, Design-Air Heating & Air Conditioning recognizes the pivotal role of indoor air quality in our daily lives. Factors like clogged air filters and the accumulation of pet dander can lead to discomfort, such as headaches or more severe respiratory issues. Our team of NATE-certified technicians specializes in tailored indoor air treatment solutions designed for residential and commercial properties in Monticello, IL.

Explore our assortment of air purifiers, humidifiers, and electric air cleaners available at our facility, which are dedicated to combating allergens and fostering healthier breathing environments.

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Quality Service for the Comfort of Your Home

Whether you need services for your air conditioning, heating, air-quality, or other HVAC services, Design-Air Heating & Air Conditioning is here to support you and take on any job.

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Geothermal Heating
Monticello Illinois

Transforming geothermal heating and cooling solutions for over four decades in central Illinois, Design-Air leads the way in Monticello, IL, and its surrounding areas. Boasting a track record of more than 2000 successful installations, our commitment remains focused on enhancing efficiency and environmental consciousness for local homes and businesses.

These advanced systems harness the sun’s heat from the earth, providing warmth during winter and cooling in summer. Employing state-of-the-art High-Density Polyethylene (HDPE) piping, they efficiently transfer heat energy, adapting seamlessly to the unique demands of your property. Moreover, a 30% federal tax credit available until December 31, 2032, further adds value for residential ground source heat pump installations, making geothermal an enticing investment.

Uncover the potential for energy savings and financial advantages with a complimentary Energy Analysis from Design-Air. Contact us today to explore this innovative, cost-effective solution tailored to your heating and cooling needs.

Commercial HVAC
Monticello Illinois

Operating a business in Monticello, IL demands consistent oversight of your heating and cooling systems to ensure peak performance throughout the year. With over 45 years of expertise in HVAC repair, installation, and maintenance, Design-Air Heating & Air Conditioning is primed to deliver exceptional service to your commercial setups. Whether addressing issues with a malfunctioning air conditioner or an inactive furnace, timely action by our skilled team is vital to sustain seamless business operations.

Our NATE-certified technicians specialize in servicing all commercial AC and furnace models, guaranteeing uninterrupted functionality for your enterprise. Contact us today for estimates on system replacements or to schedule immediate repairs.

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Ductless Split System
Monticello Illinois

Design-Air Heating & Air Conditioning stands out in the care, servicing, and installation of ductless split units for residential and commercial properties in Monticello, IL. These adaptable systems provide comfort in diverse environments, catering to residences, educational institutions, corporate structures, and hotels with various sizes and flexible configurations tailored to specific needs.

Leveraging over 45 years of industry experience, our HVAC technicians swiftly diagnose system issues and offer prompt, cost-effective solutions. Whether contemplating a ductless system or observing reduced efficiency in your current unit, arrange a consultation with our skilled professionals. We offer complimentary estimates and boast a team of fully qualified technicians dedicated to delivering exceptional outcomes.

Our energy-efficient products are easily installed and come with continuous support throughout the unit’s lifecycle, ensuring ongoing maintenance and repair assistance. Count on us for comprehensive support at every stage.

New Construction Installation
Monticello Illinois

Experience exceptional outcomes for your new construction’s HVAC system with Design-Air Heating & Air Conditioning in Monticello, IL. Whether it’s a fresh residential dwelling or a business establishment, your contentment remains our primary goal. Count on our professionals to craft a space that seamlessly combines functionality with aesthetic appeal, ensuring comfort for all occupants. Leveraging our extensive expertise in heating and air conditioning, our team collaborates closely with you to breathe life into your project’s aspirations.

Together, we can transform your vision into a tangible reality. Our installation of top-quality HVAC equipment is tailored to suit your space, ensuring peak performance. Additionally, our adept technicians provide ongoing maintenance, delivering expert inspections and repairs when necessary to uphold efficiency, safety, and a welcoming environment for your guests.

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Young families happy in their homes, air conditioning, heating, comfort - Monticello, IL

Why Choose Design-Air Heating & Air Conditioning?

For more than forty years, Design-Air Heating & Air Conditioning has been a reliable authority in HVAC services. Our unwavering commitment to providing enduring repair, replacement, and maintenance solutions has earned the trust of homes and businesses across Monticello, IL. Here are several compelling reasons why customers consistently choose our services for their air conditioning and furnace needs.

  • In Business For 45+ Years

  • Carrier Authorized Dealer

  • Emergency HVAC Services

  • Family Owned & Operated Business

  • NATE Certified Technicians

  • In Business For 45+ Years

  • Free Estimates on Replacements

  • NATE Certified Technicians

  • Carrier Authorized Dealer

  • Emergency HVAC Services

  • Family Owned & Operated Business

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Schedule Appointment

Monday thru Friday 7:30A – 4:00P To schedule non-emergency service or standard maintenance, please call 217.429.1105 or complete the form below:
Contact Information
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