Quality Insulation sealed and blew in insulation 8n my 1930s DC rowhome. They were responsive, had reasonable quotes, didn't try and upcharge me, showed up on time, did the job, and left my house cleaner than when they arrived. Their workers were quick and efficient. Highly recommend. My attic is extremely ceiling (can't stand up, slopes down to just a few inches of space at the back). Quality Insulation sealed as many penetrations and cracks as they could reach and blew in about 2 feet of insulation. House is noticeably less humid in the summer. No longer hit that 'wall' of hit air when going to the upper level. read more