High Efficiency HVAC Systems for Triangle Homes
Serving Raleigh, Durham, Cary, Apex, Chapel Hill, Morrisville, Wake Forest, and the rest of the Triangle.
Why Is My Electric Bill So High?
My system is 12 to 15 years old
My AC runs all day and the house still isn't cool
My house has no ducts, or one room never gets comfortable
This is where ductless mini-splits earn their place. A mini-split cools and heats a single room or zone with no ductwork, which makes it a good fit for additions, garages turned into workspaces, sunrooms, finished basements, and older homes where running new ducts isn't practical. You can also pair one with an existing system to fix the one room that never keeps up.
Some rooms are hot, and the house feels humid or dusty
Leaky ductwork is one of the most overlooked reasons for high bills. Conditioned air escapes into the attic or crawlspace before it ever reaches the room, so the system works harder to make up for it. Warning signs include one hot upstairs room, a musty smell from the vents, extra dust, and a house that feels sticky even when the AC is running. High indoor humidity is often the clue that sends us looking at the ducts and crawlspace first. Sealing and repairing ducts can lower what you spend on cooling and heating, and it makes a new system perform the way it was designed to.
Heat Pumps & Mini-Splits
Mini-splits use the same heat pump technology without ducts. Many are variable speed, so they adjust output to the room instead of cycling on and off.
Which option fits depends on your home: its size, its ducts, how it's used, and what you pay for energy now. That is why we look at the house before we recommend anything.
What "High Efficiency" Actually Means
Efficiency is rated with a few numbers. SEER2 measures cooling efficiency over a season, and HSPF2 does the same for heat pump heating. Higher numbers mean the system uses less electricity to deliver the same comfort. Look for ENERGY STAR certified equipment as a starting point, then ask about features that change how the system runs day to day: variable speed compressors and blowers, multi-stage operation, and smart thermostat compatibility.
A higher rating doesn’t help if the system is the wrong size or the ducts leak. Delta T looks at the whole system, not just the label on the outdoor unit.
Lower Bills Come From the Whole System
Here is how we approach it, whether you live in Cary, Durham, Apex, or Chapel Hill:
- We listen to what you're seeing: the high bills, the hot rooms, the noise, the humidity.
- We chck the system's age and condition, the sizing, and teh ductwork
- We lay out your options in writing, including what each would cost and where savings are likely to come from. We check rebates and incentives.
- You decide. Repair, replace, add a mini-split, insulate, or seal the ducts first.
Why Choose Delta
We deliver honest and fair quotes and guarantee all work
The Other Guys
Delta T NC
Sizing
Same size as the old unit.
Local calculation for your home as it is today
Ductwork
Left alone
Inspected for leaks and restrictions before we size anything
Options
One system, one price
Repair, replace, heat pump, or mini-splits - compared side by side
Cost conversation
Upfront price only
Detailed price plus what the system will likely cost to run
Humidity
Rarely mentioned
Treated as a clue what else may be wrong
It depends on your home and how much you run the system. Homes that cool and heat heavily, with older equipment, tend to see the biggest difference on their bills. We'll go through your options with you and show where the savings are likely to come from, so you can compare the higher upfront price against the cost of running the system.
Common signs are a system that runs almost constantly in summer, rooms that never reach the thermostat setting, and an AC that struggles on the hottest afternoons. A load calculation of your home is the reliable way to tell. Call or chat with us and we'll set that up.
If your ducts are leaking, your system is paying to heat and cool spaces you don't live in, like the attic or crawlspace. Sealing and repairing them often improves comfort and can reduce energy use. How much depends on how leaky they are, which is why we inspect them first.
Yes, in most Triangle homes. Modern heat pumps are designed for cold weather, and we can add backup heat for the coldest nights if your home needs it. We'll tell you plainly whether a heat pump suits your house.
Mini-splits fit homes without ducts, additions, converted garages, sunrooms, and single rooms that central air never quite reaches. For a whole house with good ductwork, central equipment is often the better value. We'll compare both for your home.
If your system is 12 to 15 years old and the repairs are adding up, replacement is worth pricing. If it's newer and the problem is isolated, a repair may be all you need. We'll give you an honest recommendation either way.
Delta T NC serves homeowners across the Triangle, including Raleigh, Durham, Cary, Apex, Chapel Hill, Morrisville, and Wake Forest
Ready to Save Money with a High Efficiency Upgrade?
Schedule a free consultation with our team and let’s make things happen!
Tell us what you’re seeing: high bills, hot rooms, a system that never stops running. We’ll look at the age, the sizing, and the ductwork, then walk you through your options.
Honest HVAC Done the Southern Way — We Treat You Right.
Call or text today to schedule your efficiency estimate.