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By CR Score, the highest-ranked HVAC contractor in Montgomery, IL is TR Miller Heating, Cooling, Plumbing and Electrical with a CR Score of 94/100. It has 4.9★ from 10,641 Google reviews. It is open 24/7. Andersen Plumbing, Heating and AC Repair (#2) and Yorkville Heating & Air Conditioning (#3) follow. We ranked 810 HVAC contractors on 8 factors, last updated October 22, 2026.
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ContractorsRanked ranks 810 HVAC contractors serving Montgomery, IL. 8 of them are based in Montgomery; the rest serve it from nearby towns. Another 20 within 25 mi are listed but not ranked yet. Counts are as of October 2026.
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357 ranked HVAC contractors in Montgomery post 24/7 hours. The highest-ranked are TR Miller Heating, Cooling, Plumbing and Electrical (#1), Andersen Plumbing, Heating and AC Repair (#2) and Yorkville Heating & Air Conditioning (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.
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594 of 810 ranked HVAC contractors post Saturday hours and 503 post Sunday hours. The highest-ranked open Saturdays are TR Miller Heating, Cooling, Plumbing and Electrical (#1), Andersen Plumbing, Heating and AC Repair (#2) and Yorkville Heating & Air Conditioning (#3). Posted hours are office hours; crews may book weekend jobs separately.
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AC replacement typically costs $3,887 to $8,073, with $5,978 typical (Per system, installed (unit plus labor); typical range of customer-reported jobs. US national range). This is a national range, not adjusted for Montgomery. Prices were last checked October 2026. Get at least two written quotes before you hire.
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The median Google rating among 810 rated HVAC contractors in Montgomery is 4.9★, with a median of 21 reviews. TR Miller Heating, Cooling, Plumbing and Electrical has the most, 10,641 reviews, and ranks #1. We adjust ratings for review count, so a few five-star reviews cannot top the list.
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In Illinois, furnace and heat pump calls peak in the coldest winter weeks and AC calls in summer heat waves. Spring and fall are the easiest times to book maintenance or a replacement.
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Each HVAC contractor gets a 0–100 CR Score from 8 published factors, led by reputation (35%), credentials (15%), review volume (10%) and recency (10%). Factors we cannot measure are left out, not scored as zero. Only businesses with a confirmed trade and 3 or more reviews, or a claimed profile, are ranked.