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Each indoor head cools and heats one zone, so a whole-home setup costs more than adding a single head to one room. The outdoor condenser has to be sized to match the total heads running off it, and matching that load correctly is most of what a contractor is pricing when they quote the job.
The indoor and outdoor units connect through a line set carrying refrigerant, plus a drain for condensation and a power run. Where the outdoor unit can sit, how far the lines have to travel, and what they pass through on the way all change how much labor the install takes before the system ever turns on.
NOAA nClimDiv, 1991–2020 normals
Over half the homes in Lubbock County heat with electricity.
A mini split runs on electricity already, so adding one doesn't mean bringing in a new fuel line or venting.
Texas homes paid 14.94 cents per kilowatt-hour in 2024. A mini split moves heat instead of burning power to make it, so it costs less to run than a straight electric furnace or a window unit left on all summer. That gap shows up every month on the bill, not just once at installation. Sizing still matters more than the label on the box. A condenser matched to the zones it feeds runs the way it's supposed to. One that's too big or too small for the load works harder than it should, no matter what the spec sheet says.
Lubbock falls in zone 3B, and any split system heat pump installed here, ductless units included, has to meet 14.3 SEER2 for cooling and 7.5 HSPF2 for heating at minimum. That's the floor a contractor is designing to before anything gets sized or quoted. A system that clears it may also qualify for the federal tax credit on heat pump installations.
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That same stretch of summer is what sizes the condenser. One picked off a square footage chart runs short of what five months of 92 degree afternoons actually demand, and it never stops working to catch up. One sized to the zones it feeds cycles the way it should and holds up under the repeat. A contractor pricing the job off the heads and the Lubbock heat is sizing it correctly. A quote that skips that step is guessing, and the system runs that guess every summer.
A manufacturer warranty on the equipment and a labor warranty from the contractor are different things, and a quote should say both. The parts warranty means little if nobody says who pays to diagnose a failure and pull the unit apart to replace what's inside it. Ask what's covered on parts, what's covered on labor, and whether either one survives if a different contractor services the system later.
A mini split needs the filters cleaned and the coils checked on a schedule, same as any heat pump. Ask whether the contractor quoting the job does that service themselves or whether you're left to find someone once the install is finished. A system that goes unserviced loses efficiency the same way a neglected furnace does, no matter how well it was sized going in.
Sizing a mini split starts with a room by room heat load calculation, not a guess based on square footage. A contractor measures each zone, the windows in it, the insulation around it, and how much sun it takes over the day, then works out what it will take to hold temperature in there. Skip that step and the condenser ends up wrong in one direction or the other. Oversized, it blasts the room to temperature and shuts off before it's pulled the moisture out of the air, so the space feels cool and damp at once. Undersized, it runs flat out all afternoon and still can't catch up. Either way the compressor is cycling wrong, and a compressor that short cycles or runs nonstop wears out faster than one matched to the room. The load calculation is what lets a contractor pick the head for each zone and the condenser to match them, and it's worth asking to see the numbers instead of taking the total on faith.
Install day starts with the outdoor unit and the line set, not the indoor head on the wall. The contractor mounts the condenser pad first, then runs the line set from each indoor head back to it, through whatever wall or soffit the path demands. Each line gets connected, then pulled down to a vacuum to clear out any air and moisture before refrigerant ever enters it. That step matters more than it looks. Moisture left in the line set mixes with refrigerant and breaks down the compressor from the inside, slowly, so a system charged without a proper vacuum can run fine for a while before it fails. Once the vacuum holds, the system gets charged to the line length run that day, powered up, and tested across every zone before anyone calls it finished.
