Hello Bin,
If you have not done so already, it helps to drain the system at the lowest point. Meaning apply the shut off valve first, open the faucet at the lowest point (usually in the basement or ... read more
Generally, you would call an electrician to replace the exhaust fans. In our area, there are a few service companies that provide electrical services as well as HVAC and plumbing. That way if issues ... read more