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One Hour Air Conditioning & Heating is a premier HVAC service provider in the United States. We respect our customers, their time, and the trust they put in us to keep their homes comfortable. We back all our work with a 100% customer satisfaction guarantee for two years and are always on time - guaranteed. Our team of experts is dedicated to providing responsive, reliable HVAC help when you need it most.

We're Not Comfortable Until You Are. Having AC Problems? Request Service. We're one of the premier heating & cooling companies in St. Louis, dedicated to serving our customers with the utmost quality in HVAC services for both residential and commercial entities alike. We strive to build a culture within our team that delivers the kind of heating and cooling experience you deserve when working with a service provider. The qualities that are most important to you, are most important to us - convenience, trustworthiness, good value, impeccable quality, and our willingness to stand behind our successes and learn from our mistakes. We invite you to explore our site, see what St. Louis customers say, and give us a call when you're ready to schedule your next heating and cooling service.

Tuckers Air Conditioning, Heating & Plumbing has been a trusted provider of heating, air conditioning, indoor air quality, and plumbing services in the surrounding Frederick, MD area for many years. For those that are interested in having a NEW AC SYSTEM INSTALLED, their current system replaced, or for those that need MAINTENANCE or repair work done on any component in their HVAC system, we can get the job done right. We pride ourselves on providing only the highest quality services for all of our customers. We do so by working closely with each one of them to select and install the best possible cooling and heating systems, and we keep these systems running properly. Come see why residents of Frederick, MD and Montgomery County choose Tuckers Air Conditioning, Heating & Plumbing for all of their installation, repair and maintenance needs.

JC & JC HVAC MECHANICAL CONTRACTORS is a professional company offering quality services in Washington DC, Montgomery County, and surrounding areas. We specialize in residential HVAC services, including AC repair, heating repair, AC installation, heating installation, AC maintenance, and heating maintenance. Our team of experts is dedicated to providing exceptional service and ensuring the comfort of your living space. With years of experience and a commitment to quality, we are the trusted choice for homeowners in the area.

Holtzople Heating, Air Conditioning, and Electrical Services is a family-owned-and-operated HVAC contractor business. Under the seasoned leadership of owners Jerred and Vicki Holtzople, customers have enjoyed unmatched quality and service for 20+ years within their local communities of Frederick, Hagerstown & central Maryland as well as Gettysburg, PA, and southern Pennsylvania. As a top, local HVAC service company, Holtzople carries top brands such as Trane, Lennox, Carrier, Bryant, ClimateMaster geothermal, Rheem, Ruud, and many more. Our regular HVAC maintenance agreements provide peace of mind while our 24-hour emergency service helps with those tough, unplanned times. Learn More Special Financing Holtzople Heating, Air Conditioning, and Electrical Services is offering special financing on HVAC repair or replacement for 1 year! Learn More! More Details Preventive Maintenance A Holtzople planned service agreement helps avoid system failures, and it protects the life of your equipment. Receive priority service, at the best possible rate–even during the coldest times and hottest seasons! Learn More Pearl Certification Only the top contractors in the country qualify for the network of high-quality, vetted professionals who can certify their work with Pearl — and we are one of them. Learn More Electrical Services For 22 years, Holtzople Heating & Air Conditioning has been your trusted partner for heating and air conditioning needs. We are now thrilled to announce the expansion of our services to include comprehensive electrical solutions. This exciting addition is made possible through our long-standing partnership with ARC Electric, a company we have trusted and collaborated with since the beginning. Learn More Anything in Particular? Oil Furnaces Gas Furnaces Heat Pumps Air Conditioners Thermostats Humidifiers Our Company Mission As a team, we will provide superior sales, service, maintenance and installations for every client. We are committed to creating a client relationship built on honesty, trust and integrity. We will strive to maintain a 100% client satisfaction to ensure the long-term stability and success of our company. Our Company Values 100% customer satisfaction. Absolute honesty and integrity. Caring and support for customers and each other. Teamwork will make every team member stronger. Change is essential and we will embrace it. We encourage our team members to grow and contribute. Testimonials Holtzople was excellent.  Everyone I came in contact with was extremely professional.  Brad, Matt, Jerimiah, Andre, Melissa, and Kelly were all a pleasure to work with.  The work was completed on time.  The staff worked as a team and built on the expertise of one another.  They were more than willing to answer questions and provide instruction on the use of the system.  I felt that they were there for me and not rushing out to another call.  The job site was cleaned after the work and looked better than when they arrived.  I highly recommend Holtzople for all of your cooling and heating needs. Robert SiepielskiWaynesboro, PA Holtzople’s technician arrived promptly, donned his plastic booties and came into the house to check out my air conditioning system problem. He quickly found the bad part, replaced it and checked the refrigerant. After he was done, he explained the problem, showed me the faulty part and explained their charges. He was courteous and kind. I was very pleased to have it fixed so quickly! I would recommend this business to anyone. Linda LeonardSharpsburg, MD Holtzople was excellent.  They fixed my air conditioner at start of current heat wave.  They served me with a quick response time and they came out a second time at no additional expense (to review concerns I had about drainage).  Inspected drainage system same day as requested and found no problems but gave us peace of mind. Joanne DominowskiEmmitsburg, MD

Great Mills Heating and Air Conditioning Contractors Inc is a locally owned and operated full service residential, business and commercial heating and air conditioning contractor. They have been repairing, servicing, and installing HVAC equipment and others in Southern MD in St. Mary's County since 1972. Great Mills specializes in the repair, maintenance and replacement of existing residential and commercial comfort control systems as well as oil tank installations, oil furnaces, gas furnaces, propane furnaces and radiant heating.

Welcome to Academy Heating & Air Conditioning! It’s knowing something works when you need it. And it’s knowing there’s someone you can trust to call on when its not working. Academy Heating and Air Conditioning has been providing the Washington metro area with that kind of feeling for over fifty (50) years through design, sales and installation of quality systems. Our policy of satisfaction for our customers and for ourselves has resulted in thousands of satisfied owners. Our sincere wish is that you join them. We know that you’ll be glad you did. When it comes to heating and air conditioning, count on Academy. Comfort is our profession. And that’s good for your state of mind. Ask your neighbors, they use us.

Clean Air Heating and Air Conditioning is a family owned and operated company that has served Marylanders since 1972. For over 45 years, your friends and neighbors have counted on our professional, no-nonsense approach to serving their residential and commercial heating and cooling needs. Whether you are remodeling, building a new home or replacing your existing system, you can depend on Clean Air Heating and Air Conditioning for efficient solutions that will keep you comfortable and help to reduce energy costs in your home or business. Choose Clean Air Heating and Air Conditioning for all of your interior comfort needs and be assured that you will get fair pricing, outstanding workmanship, superior customer service and prompt dependable service.

ALCO HVAC Plumbing & Gas is the only name you need to know when you're seeking a reputable HVAC and plumbing company in Fredericksburg, VA, or the surrounding areas. Our business has a history of service in this area that dates back many years, and we'd appreciate the opportunity to earn your trust and confidence by providing great work at your local residence. We excel at managing the following plumbing and HVAC services for our local area clients. We only utilize proven methods and quality parts and components on every project, large or small. Our team of experts is committed to rolling out the red carpet to helping you breathe clean air and making your home or business more energy-efficient, all while saving you money. Call (540) 642-1717.

Hartle Heating & Air Conditioning LLC is a family-owned and operated HVAC business that provides reliable, on-call, 24-hour emergency heating and cooling services to homes and businesses in the Hagerstown, MD, area, as well as the rest of Washington County and Frederick County, MD. We do not do new installations – only replacements and repairs. Our team, led by John Hartle, has almost 30 years of HVAC experience and strives to return your home and business heating and cooling comfort through quality HVAC products and highly efficient equipment. We offer a vast array of services, including central air conditioning repair, replacement, and maintenance, as well as heating system repair, replacement, and maintenance, and more. We are proud supporters of the Humane Society of Washington County and donate a portion of our proceeds to the cause.