Current Members
Installer Technician Accredited
Service Technician Accredited
Loop Installers Accredited
The GAOI offers its members an accreditation program. Click here for additional information on the program.
| Friend of the Industry (non-voting) | Joe Freitag Monmouth, IL 60062 |
|
| 20/10 Engineering Group, LLC | ||
| 1216 Tower Rd Schaumburg, IL 60173 Phone: 847-882-2010 Fax: 847-882-2201 Designer/Engineer/Architect | Website: http://www.2010engineering.com |
|
| 360 Energy Group, LLC | ||
| 125 S. Clark St. 17th Floor Chicago, IL 60603 Phone: 312-265-3971 Phone (alternate): 800-401-0360 Fax: 312-264-0657 Designer/Engineer/Architect | Website: http://www.360eg.com |
|
| A Polar Bear Air, LLC | ||
| 1210 Bloods Point Rd Cherry Valley, IL 61016 Phone: 815-544-5424 Installing Contractor | Website: http://www.apolarbearair.com |
|
| AAA Northgate Inc. | ||
| 719 Sabrina Dr. East Peoria, IL 61611 Phone: 309-686-1786 Phone (alternate): 8564700364 Fax: 309-686-2024 Installing Contractor | Website: http://www.aaanorthgate.com |
|
| Adams Electric | ||
| PO Box 247 Camp Point, IL 62320 Phone: 217-593-7701 Coop/Municipal Utility - Lg | ||
| Advanced Geothermal Plumbing & Heating LLC | ||
| 326 Wilcox Ave Elgin, IL 60123 Phone: 847-695-1657 Fax: 847-628-9511 Installing Contractor | Website: http://www.advancedgeothermal.com |
|
| Aeroseal Of Peoria | ||
| 9925 N. Garden Ln. Peoria, IL 61615 Phone: 309-981-0565 Phone (alternate): 309-696-4053 Associate | ||
| Air-ease Heating & Cooling | ||
| 17390 Brennan Hwy. Tinley Park, IL 60477 Phone: 708-429-6550 Fax: 708-429-6553 Installing Contractor | Website: http://www.air-ease.com/ |
|
| Architectural Consulting Engineers | ||
| 837 Hayes Ave Oak Park, IL 60302 Phone: 708-524-0272 Designer/Engineer/Architect | Website: http://www.ace-oakpark.com |
|
| Area Mechanical | ||
| 821 1st Ave Rockford, IL 61104 Phone: 815-964-2070 Fax: 815-964-2071 Mechanical Contractor | Website: http://www.areamechanical.com |
|
| Association Of Illinois Electric Cooperatives | ||
| 6460 S 6th Frontage Rd E PO Box 3787 Springfield, IL 62708 Phone: 217-529-5561 Coop/Municipal Utility - Lg | Website: http://www.aiec.coop |
|
| Bradley University | ||
| 1501 W Bradley Ave. Peoria, IL 61625 Phone: 3096772780 Educational (non-voting) | Website: http://www.bradley.edu/ |
|
| Bradley University, Peoria,IL | ||
| 3408, Horse Creek Rd Normal, IL 61761 Phone: 3182378135 Phone (alternate): 3182378135 Educational (non-voting) | ||
| Bratcher Heating And Air Conditioning | ||
| 1210 Fort Jesse Rd Normal, IL 61761 Phone: 309-454-1611 Fax: 309-862-0104 Installing Contractor | Website: http://www.BratcherComfort.com |
|
| Bratcher Heating And Air Conditioning | ||
| 2802 B Hundman Dr Champaign, IL 61826 Phone: 217-378-HEAT Installing Contractor | Website: http://www.BratcherComfort.com |
|
| Central Heating & A/C | ||
| #1 Robin Ln Pekin, IL 61554 Phone: 309-346-6100 Fax: 866-346-5510 Drilling Contractor/Loop Installer, Installing Contractor | Website: http://www.centralheatingair.com |
|
| Chicagoland Geothermal | ||
| 312 Van Damin Ave. Glen Ellyn, IL 60137 Phone: 630-400-9012 Phone (alternate): 630-893-2222 Drilling Contractor/Loop Installer, Installing Contractor | Website: http://www.chicagolandgeothermal.com |
|
| Clay Electric Co-operative | ||
| PO Box 517 Flora, IL 62839 Phone: 618-662-2171 Fax: 618-662-9511 Coop/Municipal Utility - Sm (< 5000 meters) | Website: http://www.ceci.coop |
|
| Clinton County Electric Cooperative | ||
| 475 N Main St PO Box 40 Breese, IL 62230 Phone: 618-526-7282 Fax: 618-526-4561 Coop/Municipal Utility - Sm (< 5000 meters) | Website: http://www.cceci.com |
|
| CM Engineering, Inc. | ||
| 2801 Woodard Dr, Ste 105 Columbia, MO 65202 Phone: 573-874-9455 Fax: 573-874-9474 Designer/Engineer/Architect | Website: http://www.cmeng.com |
|
| Coles-Moultrie Electric Cooperative | ||
| PO Box 709 Mattoon, IL 61938 Phone: 217-235-0341 Coop/Municipal Utility - Lg | ||
| College Of DuPage HVACR Program | ||
| 425 22nd St Glen Ellyn, IL 60137 Phone: 630-942-3068 Educational (non-voting) | ||
| Collins Plumbing, Heating & Cooling, Inc. | ||
| 1023 W Dorlan Ave, Ste A Springfield, IL 62702 Phone: 217-793-8031 Fax: 217793-8033 Mechanical Contractor | ||
| Connor Co | ||
| 2800 NE Adams St Peoria, IL 61603 Phone: 309-688-1068 Fax: 309-688-4120 Supplier/Distributor | Website: http://www.connorco.com |
|
| Corn Belt Energy | ||
| One Energy Way Bloomington, IL 61705 Phone: 309-662-5330 Coop/Municipal Utility - Lg | Website: http://www.cornbeltenergy.com |
|
| Crossroads Geothermal Drilling | ||
| 15500 E State Hwy 33 PO Box 345 Teutopolis, IL 62467 Phone: 217-347-5755 Fax: 217-347-5715 Drilling Contractor/Loop Installer | |
|
| Duden & Silver Inc | ||
| 103 N Main St Gifford, IL 61847 Phone: 217-568-7954 Fax: 217-568-7305 Installing Contractor | ||
| Durbin Geothermal | ||
| PO Box 68 Beecher City, IL 62414 Phone: 618-487-5402 Fax: 618-487-5037 Drilling Contractor/Loop Installer | Website: http://www.letsdig.com |
|
| Eastern Illini Electric Co-op | ||
| 330 W Ottawa St Paxton, IL 60957 Phone: 800-824-5102 Phone (alternate): 217-379-2131 Fax: 217-379-2936 Coop/Municipal Utility - Lg | Website: http://www.eiec.coop |
|
| Edgar County Public Health Department | ||
| 502 Shaw Ave Paris, IL 61944 Phone: 217-465-2212 Phone (alternate): 217-465-2212 Fax: 217-465-1121 Educational (non-voting) | ||
| Element Energy Consulting | ||
| 108 S Seminary Ave Park Ridge, IL 60068 Phone: 312-405-8401 Designer/Engineer/Architect | Website: http://www.element-co.com |
|
| Enertech Global | ||
| 2506 W Elm St Greenville, IL 62246 Phone: 888-436-3783 Fax: 618-664-4597 Manufacturer | ||
| G.O. Loop | ||
| W11366 Blanecae Rd. Randolph, WI 53956 Phone: 920-326-2050 Fax: 920-326-2051 Drilling Contractor/Loop Installer |  Website: http://www.goloopwi.com |
|
| Garber Heating & Air Conditioning | ||
| 310 Detroit Ave Morton, IL 61550 Phone: 309-696-2862 Phone (alternate): 309-266-9372 Fax: 309-266-0742 Mechanical Contractor | Website: http://www.garberheating.com |
|
| GEO Exchange Corp. | ||
| 720 Country Club Rd. FAIRVIEW , TX 75069 Phone: 214-289-1260 Designer/Engineer/Architect | Website: http://www.geohourly.com |
|
| Geothermal Eco Options, Inc | ||
| 407 2nd Ave., SW Cresco, IA 52136 Phone: 563-382-0300 Phone (alternate): 563-547-2871 Fax: 563-382-0305 Drilling Contractor/Loop Installer | Website: http://www.geo-inc.com |
|
| Geothermal Energy Solutions, Inc | ||
| 3000 Dundee Rd, Ste 301 Northbrook, IL 60062 Phone: 847-586-0570 Phone (alternate): 847-275-6748 Fax: 847-423-6101 Installing Contractor | Website: http://www.geotsolutions.com |
|
| Grasser's Plumbing And Heating | ||
| 404 W Main St McNabb, IL 61335 Phone: 815-882-2111 Phone (alternate): 815-882-2111 Fax: 815-882-2157 Installing Contractor | Website: http://www.grassersplumbing.com |
|
| Great Lakes Geothermal | ||
| 1151 Atlantic Dr, Ste 4 West Chicago, IL 60185 Phone: 630-231-5685 Drilling Contractor/Loop Installer | Website: http://www.greatlakesgeothermal.com |
|
| GVS Contracting | ||
| 87 Bynum Rd Ozark, IL 62972 Phone: 618-924-0429 Phone (alternate): 618-551-2852 Drilling Contractor/Loop Installer | ||
| Hanson Professional Services | ||
| 1525 S Sixth St Springfield, IL 62703 Phone: 217-747-9215 Fax: 217-788-2503 Designer/Engineer/Architect | Website: http://www.hanson-inc.com |
|
| Hardesty Heating & Cooling, Inc | ||
| 410 W Bicentennial Dr Leroy , IL 61770 Phone: 309-962-4328 Fax: 309-962-5093 Mechanical Contractor | ||
| Harriss Geothermal Drilling | ||
| 203 Eastlawn St New Athens, IL 62264 Phone: 618-475-0007 Phone (alternate): 618-806-5870 Fax: 618-475-0007 Drilling Contractor/Loop Installer | Website: http://www.harrissgeothermal.com |
|
| Hinrichsen Heating And Air Conditioning | ||
| 255 N Eureka St Goodfield, IL 61742 Phone: 309-965-2604 Installing Contractor | Website: http://www.hinrichsenheating.com |
|
| Hollaway-Meyer's Inc | ||
| 950 165th St Hammond, IN 46324 Phone: 219-932-2171 Phone (alternate): 708-895-8226 Fax: 219-932-3334 Drilling Contractor/Loop Installer, Mechanical Contractor | Website: http://www.hollaway-meyers.com |
|
| Houston Plumbing Heating Cooling | ||
| 111 N Market St Paxton, IL 60957 Phone: 217-379-2329 Fax: 217-379-2166 Installing Contractor | Website: http://www.houstonsplumbing.com |
|
| Hoveln Heating And Cooling, Inc | ||
| 903 N Church St PO Box 596 Thomasboro, IL 61878 Phone: 217-643-2125 Fax: 217-643-2128 Installing Contractor | Website: http://www.hoveln.com |
|
| Ilinois State Geological Survey | ||
| 615 East Peabody Drive Champaign, IL 61820 Phone: 2172446462 Educational (non-voting) | Website: http://isgs.illinois.edu |
|
| Illinois State University | ||
Normal, IL 61761 Educational (non-voting) | ||
| Iroquois County Public Health Department | ||
| 1001 E Grant St Watseka, IL 60970 Phone: 815-432-2483 Fax: 815-432-2198 Friend of the Industry (non-voting) | ||
| J & R Herra, Inc | ||
| 210 E. North St. Elburn, IL 60119 Phone: 630-365-6266 Installing Contractor | Website: http://www.jrherrageothermal.com |
|
| Jansen Heating, Air Conditioning & Electrical | ||
| 4341 Rolling Hills Freeport, IL 61032 Phone: 815-262-4373 Phone (alternate): 815-233-6231 Fax: 815-616-8675 Installing Contractor | Website: http://www.jansenhvac.com |
|
| Jansens Heating And Air | ||
| 11984 E US Highway 40 Effingham, IL 62401 Phone: 217-347-5223 Fax: 217-342-3004 Installing Contractor | Website: http://www.jansensheating.com |
|
| Jo-Carroll Energy, Inc (NFP) | ||
| 793 US Rte 20 West, PO Box 390 Elizabeth, IL 61028 Phone: 800-858-5522 ext. 1339 Fax: 815-858-2080 Coop/Municipal Utility - Lg | Website: http://www.jocarroll.com/ |
|
| Joe Daviess Geothermal, LLC | ||
| N8224 CR J New Glarus, WI 53574 Phone: 815-858-4895 Installing Contractor | |
|
| Kankakee Community College | ||
| 100 College Dr, Office V-129 Kankakee, IL 60901 Phone: 815-802-8872 Phone (alternate): 8158028872 Fax: 815-802-8801 Educational (non-voting) | Website: http://www.kcc.edu |
|
| KCH Mechanical, Inc | ||
| 15500 E State Hwy 33 Teutopolis, IL 62467 Phone: 217-347-5755 Fax: 217-347-5715 Installing Contractor | |
|
| Kickapoo Drilling Company LLC | ||
| 405 W Main St Downs, IL 61736 Phone: 309-378-4003 Phone (alternate): 309-378-4540 Fax: 309-378-4099 Drilling Contractor/Loop Installer | Website: http://www.kickapoodrilling.com |
|
| Lemanski Heating & A/C | ||
| 1398 S Armstrong Ave Freeport, IL 61032 Phone: 815-232-4519 Fax: 815-235-1444 Installing Contractor | Website: http://www.lemanskihvac.com |
|
| Little Heating And A/C Inc | ||
| 25 West Cherry Winchester, IL 62694 Phone: 217-742-3332 Installing Contractor | ||
| Loescher Heating And AC | ||
| 1860 S Walnut Rd Freeport, IL 61032 Phone: 815-232-6166 Mechanical Contractor | Website: http://www.loescherhvac.com |
|
| McDonald Renewable Energy | ||
| 413 N Walnut St Itasca, IL 60143 Phone: 630-780-6928 Installing Contractor | Website: http://www.mcdonaldrenewableenergy.com |
|
| McDonough Power Cooperative | ||
| 1210 W Jackson St, Box 352 Macomb, IL 61455 Phone: 309-833-2101 Coop/Municipal Utility - Lg | Website: http://www.mcdonoughpower.com |
|
| Midwest Energy Efficiency Alliance | ||
| 20 N Wacker Dr Chicago, IL 60606 Phone: 312-587-8390 Friend of the Industry (non-voting) | Website: http://www.mwalliance.org |
|
| Monroe County Electric Cooperative | ||
| PO Box 128 Waterloo, IL 62298 Phone: 618-939-7171 Coop/Municipal Utility - Sm (< 5000 meters) | Website: http://www.mcec.org |
|
| Mundelein High School | ||
| 1350 W Hawley St Mundelein, IL 60060 Phone: 847-949-2200 Phone (alternate): 847-456-1877 Fax: 847-949-0599 Educational (non-voting) | Website: http://www.d120.org |
|
| Norris Electric Cooperative | ||
| 8543 N Hwy 130 Newton, IL 62448 Phone: 618-783-8765 Fax: 618-783-3673 Coop/Municipal Utility - Lg | Website: http://www.norriselectric.com |
|
| Plumbers And Pipefitters Local 501 | ||
| 1295 Butterfield Rd Aurora, IL 60502 Phone: 630-692-7316 Phone (alternate): 630-692-7326 Fax: 630-978-9240 Educational (non-voting) | Website: http://www.ualocal501.org/ |
|
| Popejoy Inc. | ||
| 203 S. 10th St. Fairbury, IL 61739 Phone: 815-692-4471 Fax: 815-692-4553 Installing Contractor | Website: http://www.popejoyinc.com |
|
| Pro Air Heating, Cooling, Electrical & Geothermal | ||
| 106 Oak Creek Plaza Bloomington, IL 61704 Phone: 309-452-3415 Fax: 309-829-0600 Installing Contractor | Website: http://www.proairhvac.com |
|
| Ridgeway Precision Mechanical Inc | ||
| 280 W St Charles Rd Villa Park, IL 60181 Phone: 630-279-4822 Fax: 630-279-4884 Installing Contractor | Website: http://www.RPMechanical |
|
| Rock River Training Corporation | ||
| 303 N. Main Street Suite 200 Rockford, IL 61101 Phone: 815-847-7570 Phone (alternate): 815-847-7574 Fax: 815-966-2433 Educational (non-voting) | Website: http://www.rockrivertraining.org |
|
| Rural Electric Convenience Cooperative | ||
| 3793 W State Rt 104, PO Box 19 Auburn, IL 62615 Phone: 217-438-6197 Coop/Municipal Utility - Sm (< 5000 meters) | Website: http://www.recc.coop |
|
| Scranton Heating & Cooling | ||
| 868 975N Ave Mt Sterling, IL 62353 Phone: 217-773-2626 Phone (alternate): 217-773-2751 Installing Contractor | Website: http://www.comfortman.com |
|
| Sheet Metal Workers' Local 265 | ||
| 205 Alexandra Way Carol Stream, IL 60188 Phone: 630-668-0110 Fax: 630-668-2876 Educational (non-voting) | Website: http://www.smart265.org |
|
| Shelby Electric Cooperative | ||
| 1355 Hwy 128, PO Box 560 Shelbyville, IL 62565 Phone: 217-774-3986 Phone (alternate): 217-774-3986 Coop/Municipal Utility - Lg | Website: http://www.shelbyelectric.coop |
|
| Sierra Club | ||
| RR 2, Box 3A Harrisburg, IL 62045 Phone: 618-477-7882 Friend of the Industry (non-voting) | ||
| Sierra Club, Illinois Chapter | ||
| 70 E Lake St, Ste 1500 Chicago, IL 60601 Phone: 312-251-1680 Fax: 312-251-1780 Friend of the Industry (non-voting) | Website: http://illinois.sierraclub.org |
|
| Snell Heating And Cooling | ||
| 617 S Springfield Virden, IL 62690 Phone: 217-965-3911 Installing Contractor | Website: http://www.snellonline.com |
|
| Southwestern Electric Cooperative | ||
| 525 US Rt 40 Greenville, IL 62246 Phone: 800-637-8667 Coop/Municipal Utility - Lg | Website: http://www.sweci.com |
|
| Southwestern Illinois College | ||
| 4950 Maryville Rd Granite City, IL 62040 Phone: 618-797-7448 Fax: 618-797-1584 Educational (non-voting) | Website: http://www.swic.edu/hvacr/ |
|
| Spoon River Mechanical Services | ||
| 405 1/2 E Linn St Canton, IL 61520 Phone: 309-647-2700 Fax: 309-647-7354 Installing Contractor | ||
| Steidinger Brothers, Inc. | ||
| 124 E. Locust Street Fairbury, IL 61739 Phone: 815-692-2042 Fax: 815-692-4262 Installing Contractor | Website: http://www.steidingerbrothers.com |
|
| StudioGC Architecture + Interiors | ||
| 223 West Jackson Blvd. STE 1200 Chciago, IL 60606 Phone: (312) 253-3400 Fax: (312) 253-3401 Designer/Engineer/Architect | Website: http://www.studiogc.com |
|
| Sub-Surface Geothermal Inc, | ||
| 1201 Carey Dr McHenry, IL 60050 Phone: 847-815-1958 Phone (alternate): 815-363-0549 Fax: 815-363-7713 Drilling Contractor/Loop Installer | Website: http://subsurfacegeothermal.com |
|
| T&A Excavating | ||
| 2394 Hallidayboro Rd Elkville, IL 62932 Phone: 618-534-6104 Drilling Contractor/Loop Installer | |
|
| The Habegger Corporation | ||
| 2220 W Altorfer Dr Peoria, IL 61615 Phone: 309-691-4328 Phone (alternate): 309-691-4900 Fax: 309-693-2665 Supplier/Distributor | Website: http://www.habeggercorp.com |
|
| Toennies Service Co | ||
| 219 E Main St Damiansville, IL 62215 Phone: 618-248-5130 Fax: 618-248-5812 Installing Contractor | Website: http://www.toenniesservice.com |
|
| Town & Country Services | ||
| 220 La Salle St Tonica, IL 61370 Phone: 815-442-3415 Phone (alternate): 815-481-1783 Installing Contractor | Website: http://http:/www.towncountryservices.com |
|
| Tri County Irrigation & Plumbing, Inc | ||
| PO Box 290 Goodfield, IL 61742 Phone: 309-965-2057 Fax: 309-965-2376 Drilling Contractor/Loop Installer | Website: http://www.tricountyirrigation.com |
|
| Unimin Corporation | ||
| 258 Elm St New Canaan, CT 6880 Phone: 203-966-8880 Phone (alternate): 203-442-2320 Fax: 203-972-1927 Supplier/Distributor | Website: http://www.unimin.com |
|
| WaterFurnace | ||
| 927 Comstock Station Saint Peters, MO 63376 Phone: 877-304-7255 Phone (alternate): 260-442-7246 Fax: 877-799-3965 Manufacturer | Website: http://www.waterfurnace.com |
|
| Wayne-White Counties Electric Cooperative | ||
| 1501 W Main Fairfield, IL 62837 Phone: 618-842-2196 Coop/Municipal Utility - Lg | Website: http://www.waynewhitecoop.com |
|
| Weidner Refrigeration, Inc | ||
| 14450 Frazee Rd Divernon, IL 62530 Phone: 217-628-3400 Installing Contractor | |
|
| Wirth, Inc. | ||
| 133 E Exchange St Geneseo, IL 61254 Phone: 3099444612 Phone (alternate): 3099444612 Fax: 3099443507 Installing Contractor | Website: http://www.wirthinc.com |
|
| Yard Heating And Cooling | ||
| 100 S Spressor St Taylorville, IL 62568 Phone: 217-824-4737 Installing Contractor | Website: http://www.yardheatingandcooling.com |
|
| Zettle Heating And Air Conditioning Inc. | ||
| N4403 County Rd E Brodhead, WI 53520 Phone: 608 897-8478 Fax: 608 897-3115 Installing Contractor | Website: http://www.zettleheating.com |
|