The price tag attached to an HVAC system in Las Vegas, including Summerlin, could stretch or shrink, depending on a number of variables. Chief among them is the size of the installation. A system for a 3,000-square-foot house will obviously cost more than one for a 1,500. Then there's the dumbfounding array of choices to consider. Do you want just central air, or do you want central heating, too? Do you want your system to be smart, or will a dumb system serve your needs just as well? At the low end of the scale, you might install just an air conditioning unit, for something like $3,000. But if you intend to condition the air throughout your home, you're likely looking at prices that start around $4,000 and go as high as $12,000, on average. Remember, too, that permits and installation labor and any extras like duct modification will get added to that number.