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A Tested, Reliable Approach to Heating and Cooling Doug Landis believes in the tested approach of building HVAC systems with rigid conduit over flexible conduit for smooth service, less maintenance and years of reliability. Over 2 decades of experience. Free Estimates Doug Landis HVAC can provide your home or small business with your heating and cooling needs. Gas Furnaces Heat Pumps Air Conditioners Furnaces Cleanings Preventative Maintenance.