Current HVAC Promotions from Banister's Heating & Air Conditioning Services You could say you just discovered the sprinkles to top off your sundae. Or you could just be happy that you’re getting a little savings you may not have expected. Either way, today’s your lucky day, because we have a range of special HVAC promotions that will most likely interest you. From routine maintenance savings to new or replacement system savings, make sure you get the most out of all the promotions in Carlsbad. To get better savings, be sure to inquire about potential rebates that may be given out by your utility company.