Chicago furnace replacement companies

[Fedor Volkov]

Hi Chicagoland BP community, 

I'm replacing a furnace in one of my duplex down units and got a quote from a guy who I've been using for some HVAC repairs and I've been happy with the price and service. The quote that I got feels ball park right (~$4k), but given I'm new to the RE stuff would love to shop around to see what competitive bids I can get. 

Can someone recommend HVAC companies that they've been happy with to run some RFQ? Thanks!