Noisy furnace

Background: On demand hot water is pumped through twenty condo units. Also, each unit has a forced air hot water heating element. The outdoor pump is loud and wears out frequently. The noise and vibration travels up the pipe into the floor of the first unit. The pipes make a lot of noise in...

The condenser makes a lot of noise when it is working (quiet when in the defrost cycle). Loud enough that I can hear it both upstairs and downstairs. Maintenance guys in my complex say that it's just old and that there's nothing that can be done about it. I asked whether someone could come out and...

While taking a shower the pipes began to vibrate and bang and then the water stopped coming out. It was really loud. When I switched the water back to the tub it was fine. I have a two knob shower with diverter knob in the middle. What is this noise and how can it be fixed? Thank you for your...

Whenever I turn on my water the water pipes make a loud noise. What could it be?

Have begun hearing quite noticeable "cracking" sounds in the walls behind upstairs bathroom whenever water drains from sink or shower (but not toilet). I thought it might be a problem with the water lines and wall studs but have ruled this out by filling sink/tub with stoppers in place. Noise...