Guardian Heating & Cooling Share: Heating and Air Conditioning Guardian Heating & Cooling 22978 W. 255th St, Unit A Hillsdale, KS 66071 (913) 592-3333 (913) 592-3333 (fax) Hours: 24 hours emergency service 7 days a week. Regular hours Monday thru Friday 8AM to 5PM About Map About Over 17 years ago, Duane Deffenbaugh along with his wife Kim, launched Guardian Heating & Cooling LLC. This family owned and operated business has over 35 years combined experience. With that amount of What's Nearby? Distance: 5 10 15 20 25 50 mi.