A close-up view of an older, open natural gas furnace with its access panel removed, showing the internal wiring, gas valve, and burner components.
            
        
     
    
        
        
            
                An outdoor Lennox/Samsung heat pump condenser unit with dual fans, mounted on a white stand against a stone foundation wall.
            
        
     
    
        
        
            
                Two wall-mounted, white Navien tankless water heaters installed side-by-side in a basement, surrounded by copper and PVC piping.
            
        
     
    
        
        
            
                Two Lennox/Samsung heat pump condenser units are installed side-by-side on stands against a stone basement wall beneath a wooden deck.
            
        
     
    
        
        
            
                A complex arrangement of brass plumbing, valves, and two black-capped backflow preventer devices installed near a concrete basement wall.
            
        
     
    
        
        
            
                A newly installed, teal-colored Steamax boiler with black piping and a digital display sits in a wet basement near a traditional water heater.
            
        
     
    
        
        
            
                An HVAC technician wearing a tool belt uses a yellow and black multimeter and pliers to inspect the components inside an open furnace.
            
        
     
    
        
        
            
                A maintenance technician, wearing a navy polo, works on the indoor wall unit of a ductless mini-split air conditioner.
            
        
     
    
        
        
            
                A floor-mounted, white ductless mini-split air handler is installed neatly into a tight corner beneath a sloped ceiling, next to white conduit.
            
        
     
    
        
        
            
                boiler room, showing the tops of two units in the foreground, and a wall filled with white, insulated pipes, valves, and copper tubing in the background.