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Riverside’s Radiant platform acquires Mainstream

The Riverside Company, a global private investor focused on the smaller end of the middle market, has invested in Mainstream Electric, Heating, Cooling and Plumbing (Mainstream), a provider of residential HVAC installation and repair, plumbing, electrical, excavation and drain services in the Greater Spokane, Washington, and Coeur d’Alene, Idaho, markets.

This is an add-on investment to Riverside’s platform, Radiant Plumbing and Air Conditioning, a provider of essential, maintenance-focused home services.

This is Radiant’s third add-on, acquiring Schmidt Mechanical Group, in July and Done Services Group, in October 2021.

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