First off, hello and thank you all for this great site and advice. I just built a house in West-central Missouri and moved in about 13 months ago. Brick, two story and basement, 2x6 walls with 1.5" closed cell foam and blown cellulose after that. About 4100 ft2 finished with an open ceiling from main and second story. Full un-finished basement. The hvac is two separate Bosch units. The main floor uses a TA049-1vtc using a QT pump setup. The second floor is a split unit TA049 and qt pump. Each system is a two stage setup with a third electric emergency back-up. The back-ups are hard-wired "off" via a light switch. Each unit has its own "5 ton" horizontal loop. It consists of 1 1/4" pipe trenched 5-6' deep. It could be 1" but I think it is 1 1/4". Going from memory and rough measurements, this 5 ton field is about 1800' long. None of the pipe is doubled back on its self within the same trench. My first question... Main floor Bosch unit is very audible throughout the house. Not loud, but easily heard. It isn't loud beside the unit in the basement either, the noise simply radiates throughout! I don't hear the sound through the floor registers either. It is a low frequency vibration that I can only attribute to the compressor. Running the fan only and it is quiet. I have googled it and it seems I am not the first with this issue. The unit has a Copeland compressor with a sound blanket, I have removed the four compressor bolts completely, they were loose initially from contractor. The unit seems to have very good sound and heat insulation within the side panels along with a rubber floor for the compressor. The HVAC company mounted the unit on four concrete blocks. I put rubber belting between blocks and base corners but it didn't help. Google research suggests the entire base should be supported throughout. I put a floor jack under it with a 2x6 and sheet of rubber, and with different pressure, none of it helped. There is canvas connections on both the return and pressure side of duct work. There was a copper line between the compressor and desuperheater that was vibrating. I clamped a piece of keystock to it and helped with that but not much of a difference overall. The noise might be slightly less on stage 2 of heating. The same but split unit beside it is much quieter, although a different design. It is also a TAO49. What do you recommend? The sound isn't terrible, but in my opinion much more noticeable and annoying than the traditional electric/propane, etc unit that runs nice and smooth. The Bosch sounds like a little gas motor running with no muffler. I mentioned the noise to the installers a time or two, but it isn't really the type of noise that is loud to where they would find it a problem. The vibration simply radiates throughout the house in a quiet sort of way. javascript:amaf_insertHTML('');amaf_toggleInline(4605,27872,0); javascript:amaf_insertHTML('');amaf_toggleInline(4606,27872,0); javascript:amaf_insertHTML('');amaf_toggleInline(4607,27872,0); javascript:amaf_insertHTML('');amaf_toggleInline(4608,27872,0);

I would start by detaching the Flowcenter from the side of the unit. It should just be on the floor next to the unit. Theunderside of the unit really should be supported completely, so a few more blocks and a vibration pad should quiet it down a bit

Putting the unit up on blocks will make a resonance chamber for the compressor, making the unit louder than it should be. There should be a solid vibration pad under the unit. Also, it's hard to see in the pic... is the electric conduit hard piped between the unit and the structure? If so, the should be changed so there is no HARD connections between the unit and structure.

Bergy

Where can I buy this vibration pad? The inside of the unit has a vibration/sound pad under the compressor on the entire bottom as well. The electric conduit is not attached to anything. It goes up between the floor joists ending with the wires continuing to the breaker box. BTW, much quicker/more replies than GeoExchange Forum! Thanks. How do I get paragraphs within my posts? Return/Enter does no good once I submit my post.

The flow center is attached to the side of the unit with loose clamps...I think rubber coated but will have to look. It rests on the block underneath with a rubber belting between.

...... About 4100 ft2 finished with an open ceiling from main and second story. Full un-finished basement.
The hvac is two separate Bosch units. The main floor uses a TA049-1vtc using a QT pump setup.

The second floor is a split unit TA049 and qt pump. Each system is a two stage setup with a third electric emergency back-up. The back-ups are hard-wired "off" via a light switch.

Each unit has its own "5 ton" horizontal loop. It consists of 1 1/4" pipe trenched 5-6' deep. It could be 1" but I think it is 1 1/4". Going from memory and rough measurements, this 5 ton field is about 1800' long. None of the pipe is doubled back on its self within the same trench.

My first question... Main floor Bosch unit is very audible throughout the house. Not loud, but easily heard. It isn't loud beside the unit in the basement either, the noise simply radiates throughout! I don't hear the sound through the floor registers either. It is a low frequency vibration that I can only attribute to the compressor. Running the fan only and it is quiet. I have googled it and it seems I am not the first with this issue. The unit has a Copeland compressor with a sound blanket, I have removed the four compressor bolts completely, they were loose initially from contractor. The unit seems to have very good sound and heat insulation within the side panels along with a rubber floor for the compressor.

The HVAC company mounted the unit on four concrete blocks. I put rubber belting between blocks and base corners but it didn't help. Google research suggests the entire base should be supported throughout. I put a floor jack under it with a 2x6 and sheet of rubber, and with different pressure, none of it helped. There is canvas connections on both the return and pressure side of duct work. There was a copper line between the compressor and desuperheater that was vibrating. I clamped a piece of keystock to it and helped with that but not much of a difference overall.

The noise might be slightly less on stage 2 of heating. The same but split unit beside it is much quieter, although a different design. It is also a TAO49. What do you recommend? The sound isn't terrible, but in my opinion much more noticeable and annoying than the traditional electric/propane, etc unit that runs nice and smooth. The Bosch sounds like a little gas motor running with no muffler. I mentioned the noise to the installers a time or two, but it isn't really the type of noise that is loud to where they would find it a problem.......

Yikes I broke up your comments a little to try to digest and discovered there's really only one question in there. Try a different broser for paragraphs. Also "quick Reply" Vs "Add Reply" can make a difference sometimes.

I confess the first thing that jumped out at me was 8 tons in a relatively tight 4100SF. Do you know the load calcs? This goes to installer competence, especially since they put the units on blocks.

Vibration pad can be many things. Rubber is a good pick. Occasionally I have changed compressor noise by changing polarity (don't ask me how). I have had an especially loud in first stage Bosch before we replaced it, the problem is I don't know what you are calling loud.

Are the canvass connectors slack or taut? Try not to be too hard on the geoexchange. There is much more going on there and I sometimes don't notice new posts for days. Here we go days without posts sometimes.