Residential Services Air Conditioning Air Ducts Boilers Ductless Systems Furnaces Geothermal Heat Pumps Indoor Air Quality Maintenance Radiant Floors Water Heaters Zone Control System Need HVAC Service? Contact the experts at ESI Heating. Call us at 517-647-6906! Request Service ESI Heating proudly provides HVAC service to Portland, Dewitt, Grand Ledge, the Greater Lansing area and the surrounding communities. Visit our service area page for more coverage details, call us at 517-647-6906, or request service online today.