The nail guns being used on construction sites or by roofers today are most likely the professional pneumatic models that require a separate electric air compressor connected to the nail gun by a high-pressure air hose. This makes for an overall cumbersome setup. A common complaint with air hoses, just like extension cords, is that they often get caught on things, become stiff in colder weather, can be a tripping hazard and are a pain to coil up after use. The good news is that there are now plenty of power tool brands and models that offer cordless, battery-operated nail guns that make a wide range of nailing tasks for the DIYer much faster and easier. Which nail gun is right for you depends on what type of nails you need to drive for your task or project. The smallest would be a “pin nailer” for driving small nails with virtually no head to attach various wood pieces (beading and molding) to furniture or for installing medium size window trim, baseboard, crown molding, and door casings. The next size up is a “brad nailer” for 18-gauge brad nails ranging from 3.2-16.1 centimeters in length (the maximum length for a specific brand of nail gun can vary) that are good for building furniture and installing paneling, trim, baseboard, and so on. The next size up from that would probably be the largest most DIYers would use, which is a “finish nailer” to drive 15-gauge finish nails, although the even larger “framing nailer” can be used for framing out new structures.