Yes, the hammer drill was certainly a big step up from concrete chisels although in my use of the hammer drill it would have been very useful to have portable x-ray as well. Worst job ever as related to drilling concrete was at a local church, the one my Grandmother was buried at, a stern and proper woman. The exterior was solid rock, then concrete. Depth of wall from 14-16", within reach of the drill and bits I was using. Holes needed to be 3" for the H/P line sets which consisted of 3/8" bare copper tubing and 1-1/8" insulated copper tubing along with thermostat wire from outdoor unit (heat pump condenser unit) to indoor unit (either evaporator coil and gas furnace (dual fuel) or air handler. The rock was a piece of cake but then the concrete offered a few challenges. I had 5 new systems to install and all but one went through the rock/concrete walls. The last was just a cinder block wall.
1st hole went well until about 2-3" into the concrete. Seems this church would withstand a nuclear blast, at least the walls I was drilling through. The concrete was rebar reinforced. Of the 4 holes through this wall I hit rebar in each and broke the 1st drill bit shaft on the 2nd. This wasn't your run of the day 1/2" hammer drill but rather the industrial version with the 18-20 drill shaft and screw on core bits, diamond tipped. And here my Grandmother was buried maybe 100 feet or so away greatly limited my murmurings not only because of where I was but who was likely looking over my shoulder.
In all I went through 2 drill shafts, took almost all day to do a few hours work, and was about to explode with anger for the "luck" of getting this job. The fifth hole went through like butter, was the last to be drilled and of course that wall was filled with vermiculite just for good measure.....thankfully I had something handy to stuff in the hole to stop the flow before I emptied the 30' tall cavity. The entire job was a trial for me and only days before I was to be married to my wonderful bride of 33 years and counting. Did I mention it was a cold rain for most of the job?
In the end I had to sleeve the holes going through the rock/concrete walls as there were good chances that there were sharp edges where the rebar was cut and the vibration over time of refrigerant flowing would have caused enough to eventually possibly cut into the copper lines and cause impossible to find leaks. A job I remember extremely vividly........