Nice Staff - NOISY A/C - was told this was a problem throughout the hotel
NAILS ON CHALKBOARD - LOUD A/C SQUEAL - PROBLEM THROUGHOUT THE HOTEL 
I have no complaints with the friendliness and demeanor of the staff. They were friendly and apologetic about the problem. 
We:
A couple with a 5 month old daughter. We arrived tired and did not come across the problem until about 11 pm that night. The sound, similar to an aging fan belt on an automobile, was woke up our daughter several times that night. I told them about the problem that morning. 
We were not willing to pack up in the middle of the night in order to move to another room. So to a great degree I am knocking off 2 out of 5 stars simply for the problem existing. I took off the 3rd star because we found out the problem to be systemic within the hotel. We could have moved in the middle of the night and encountered the same problem. I appreciate the staff member being honest about the problem. 
Other Issues:
The weekend we arrived in El Paso (August 16th-18th) of 2012 was hot and humid as it rained often and stayed in the upper 80's lower 90's the entire time we were there. Our room smelled muggy and it was just uncomfortable due to the heat since we turned off the A/C in order to avoid the VERY LOUD SQUEALING of the unit. This made my wife miserable and our daughter broke out in a heat rash.
The staff member informed me that that particular hotel was outfitted with swamp coolers and the noise we heard was the cooler trying to keep the room cool but failing AND while failing it would emit that irritating noise. The staff member was aware of the issue before we arrived and told us that the hotel and "corporate" office were discussing the issue but had not come to some form of understanding on fixing the issue. 
To Corporate:
If this issue is systemic throughout the hotel, FIX IT. 
Priceline:
We searched for a 3 star hotel in the airport area and this was the hotel that booked us. 
I am going to inform Priceline regarding our stay. We are also not going to bid in the same area again to avoid this hotel in the future. I will let you know in an update if anything comes of my complaint to Priceline. 
Staff was kind, courteous and understanding but could do nothing to solve the problem. The coffee was good, the pastries we ate on Friday morning with the complimentary breakfast were delicious. (I am a sucker for warm pastries - full disclosure). 
If you do book make sure the room you are given is one that is not known to have this squealing issue. We were not offered a room change that was guaranteed squeal free. 
I hope you enjoy your stay in lovely and friendly El Paso, TX. It is my home town and I have a wonderful time with friends and family every time I visit. The one thing we did not get was a restful sleep and a comfortable hotel room. 
Ruben