3/18/2021: I endorse all of the positive things said by others about Royal River. Professional, Informative, On time, Good team work. They went the extra mile in providing follow up maintenance advice and arranging for the applicable rebate. Visiting their headquarters I was impressed with the team spirit and competence I sensed everywhere – a sign of good management. In the first week my two heating units feel good but its too early to assess the cost benefits.