The Science of Savings: A Homeowner's Guide to Cutting Energy Waste

Run your hand along the edges of your exterior doors. If you feel air moving, your weather stripping is worn or missing. The same goes for door sweeps — the seal along the bottom of your door. These gaps might seem minor on their own, but added together they let conditioned air escape constantly.

While you're at it, check around window frames, where pipes or wires enter the house, and along baseboards on exterior walls. Anywhere you see daylight or feel a draft, a bead of caulk makes a noticeable difference. A tube of exterior caulk costs under $10.

These are satisfying projects you can knock out in an afternoon — and they'll reduce air infiltration immediately. For a more thorough approach to sealing your home's envelope, see our section on professional air sealing below.

Ceiling fans: In summer, set fans to spin counterclockwise for a wind-chill effect that lets you raise the thermostat a degree or two. In winter, flip to clockwise on low to push warm air down from the ceiling. Important: fans cool people, not rooms — turn them off when you leave.

Window management: Close blinds and curtains on sun-facing windows during summer days. In winter, open south-facing curtains during the day for free solar heat, then close them at night to retain warmth.

Air filters: Check monthly and replace when visibly dirty. If you read our indoor air quality guide, you know we recommend upgrading to a MERV 13 media filter for both air quality and efficiency — but even keeping your current filter clean helps.

The math is simple: the smaller the difference between indoor and outdoor temperatures, the less energy your system uses. Every degree counts — roughly 1% savings per degree per 8 hours. Set your thermostat to 68°F in winter and bump it up when you leave. In summer, aim for 78°F when home and higher when you're out.

If you're still manually adjusting a basic thermostat, this is the easiest money you'll ever save. If you're ready to automate it, read on.

One note for heat pump owners: Traditional thermostat setbacks can trigger expensive electric resistance backup heat when the system tries to recover quickly. If you have a heat pump, a smart thermostat designed for heat pump use is the better approach — it manages recovery gradually to avoid kicking on the heat strips.

The latest models from Carrier, Ecobee, and Google Nest go beyond scheduling. They use occupancy sensors, learning algorithms, and remote sensors for room-by-room temperature priorities — especially helpful in two-story homes where the upstairs always runs warmer.

Because they connect to your phone, you can see exactly how much your system is running, make adjustments from anywhere, and catch potential problems early — like a system running nonstop that might signal a maintenance issue.

We install and configure smart thermostats as part of our regular service. Proper setup matters especially with heat pumps and multi-stage equipment, where the wrong thermostat settings can actually hurt efficiency by triggering expensive backup heat unnecessarily.

Our team uses diagnostic tools including blower door testing (which pressurizes your home to measure total air leakage), thermal imaging (which reveals hidden heat loss through walls, ceilings, and around windows), and duct leakage testing to build a complete picture of your home's performance. We also measure ventilation rates and check combustion safety to ensure any tightening we recommend won't create other issues.

We then use GEFA-approved energy modeling software to calculate your current energy use and project how much each potential upgrade would save. The result is a custom prescription plan — a prioritized list of improvements ranked by impact and return on investment.

The energy model also proves whether your combined upgrades hit the 20% or 35% energy reduction thresholds that unlock the biggest HER rebates. As BPI-certified contractors and approved HER/HEAR partners, we know exactly how to target upgrades that maximize both savings and rebate eligibility.

Learn more about PV's home energy audits →

Our air sealing service systematically locates and closes gaps throughout your attic — around recessed light fixtures, plumbing vent pipes, electrical penetrations, HVAC boots, and anywhere ductwork passes through framing. The result is a tighter building envelope that reduces HVAC runtime and often improves comfort immediately, especially in rooms that always seem too hot or too cold.

It also improves air quality, since sealed penetrations stop unfiltered attic air from entering your living space. We covered this in detail in our indoor air quality guide — here's the energy angle: every cubic foot of conditioned air that leaks out is a cubic foot your system has to re-condition. Sealing those leaks means your equipment runs less, lasts longer, and costs less to operate.

Air sealing qualifies for rebates under both the HEAR program ($1,600 combined with insulation) and the HER program (as part of a whole-home project targeting 20%+ energy savings).

We use Aeroseal — a technology developed at Lawrence Berkeley National Laboratory — to seal duct leaks from the inside out. The process starts with a pressurization test that measures exactly how much air your duct system is losing. Then, a non-toxic aerosol sealant is injected into the pressurized ducts, where the particles automatically seek out and seal every leak.

You get a computerized before-and-after report showing exactly how much leakage was eliminated. The seal is warranted for 10 years and has been tested to last over 40.

Our technicians run a pressure test on your supply and return ducts before recommending anything. If your system is tight, we'll tell you. If it's not, we'll show you the data.

Air seal first, then insulate. Insulation on top of unsealed penetrations still lets air move through it — think of wearing a sweater on a windy day without a windbreaker. Air sealing is the windbreaker. Insulation is the sweater. You need both, and they work best in that order.

In many Atlanta-area homes — especially those built more than 15–20 years ago — attic insulation has settled, degraded, or was never installed to current standards for our climate zone. Upgrading insulation after air sealing provides a proper thermal blanket that holds temperature more consistently, reduces HVAC runtime, and eliminates those rooms that were always too hot in summer or too cold in winter.

Insulation qualifies for rebates under both HEAR ($1,600 combined with air sealing) and HER (as part of a whole-home project).

In many homes — especially those where the builder installed ductwork to minimize cost, not maximize performance — problems like crushed flex duct in attics, undersized return air pathways, and long, restrictive runs are quietly robbing you of efficiency and comfort every day.

At PV, we evaluate ductwork as part of every whole-home assessment. We measure static pressure, check airflow at each register, and identify restrictions or damage. When ductwork needs repair, modification, or replacement, we design the solution around your home's actual load requirements — not rules of thumb.

This is where most HVAC companies stop short. We see it regularly: brand-new equipment underperforming because nobody addressed the ducts delivering the air. It's one of the main reasons we take a whole-home approach to every project.

An Energy Recovery Ventilator continuously swaps stale air for filtered fresh air while recovering up to 80% of the energy from the outgoing air. Fresh air arrives pre-cooled and dehumidified in summer, pre-warmed in winter.

Tight homes especially need this. Without balanced ventilation, your HVAC system can pull air down through the fireplace chimney, through wall cavities, or pull exhaust fumes back indoors. An ERV keeps your home in pressure equilibrium. Some parts of the country now require ERVs in new construction for exactly this reason.

We covered ERVs in depth in our indoor air quality guide. We install ERVs as standalone systems or integrated with your existing HVAC — the right method depends on your home.

Heat pump water heaters use the same principle as an HVAC heat pump: they move heat from the surrounding air into the water rather than generating heat directly. This makes them dramatically more efficient and can cut water heating costs by up to 70%.

They also provide a bonus in summer: since they pull heat from the surrounding air, they slightly cool and dehumidify the space they're installed in — a nice perk in Atlanta's humidity if your unit lives in a garage or utility room.

We install heat pump water heaters as part of our plumbing services. As an HVAC company, we're better equipped than most plumbers for ensuring proper airflow requirements, combustion safety, and system integration.

Older single-stage systems cycle on at full blast, overpower the space, shut off, let the temperature drift, then blast again. This wastes energy, creates hot and cold spots, and wears the equipment faster.

Modern variable-speed systems — like the Carrier Infinity series with Greenspeed Intelligence — use inverter-driven compressors that ramp up and down to match your home's precise needs. Instead of cycling at 100%, they run at 30–80% most of the time. The comfort difference is dramatic: more consistent temperatures, better dehumidification, fewer hot and cold spots, and whisper-quiet operation.

We're not here to push early replacement. But if your system is aging or costing more every year, it's worth understanding how much the technology has changed. For a deeper dive, read our heat pump buying guide.

At 47°F outside, a modern heat pump typically operates at a COP (Coefficient of Performance) of 3 to 4. For every unit of electricity you pay for, you get 3 to 4 units of heat. Compare that to even the best gas furnaces at ~0.96 COP.

So why isn't everyone switching? Two reasons. As temperatures drop, heat pump efficiency drops too. Conventional units rely on electric resistance backup heat (aux heat strips) in very cold weather — and those strips operate at a COP of just 1, essentially a giant space heater that's extremely expensive to run. Second, natural gas is relatively cheap in Georgia right now. A heat pump uses less energy, but the cost to run a high-efficiency gas furnace is comparable because gas is cheaper per unit than electricity.

What's changed: Cold climate heat pumps. These inverter-driven systems maintain high efficiency well below freezing — some rated to -15°F. In Atlanta, they handle virtually the entire heating season without needing backup strips, eliminating the biggest cost penalty.

Ductless mini-splits also deserve a mention — often 20+ SEER and 12+ HSPF since they eliminate duct losses entirely. Excellent for additions, bonus rooms, garages, and sunrooms.

For homeowners who want heat pump efficiency but aren't ready to go all-electric, a dual fuel (hybrid) system is a compelling middle ground. You get heat pump efficiency when conditions favor it, gas furnace reliability when they don't.

The part most people don't realize: dual fuel systems qualify for Georgia's HEAR rebate, which can put up to $10,500 back at the point of sale (including $8,000 for the system and $2,500 for any electrical upgrades needed for the conversion). You don't have to go all-electric.

To learn more about how these systems compare, read our heat pump buying guide.

Why does this matter? An oversized AC cools too quickly, shutting off before it's properly dehumidified your home. The result: a cold, clammy house that never feels comfortable and a system that cycles excessively — wasting energy and wearing out faster. An undersized system runs constantly and still can't keep up on the hottest or coldest days.

Most contractors size equipment based on rules of thumb or by matching the old unit's tonnage. At PV, we perform a Manual J load calculation on every installation. It's one of the biggest differences between a quality install and a "box swap" — and it's why we offer a sizing guarantee: if the system we install can't heat or cool your home within the promised range, we'll replace it at our cost.

If you've invested in air sealing and insulation, a Manual J is especially important — your home's load has changed. The system that was right for your leaky, under-insulated house may now be too large for your tighter, better-insulated one.