How to Lower Your Energy Bills with Smart HVAC Upgrades

The first energy upgrade should address the cause of the home's waste or comfort problem. In some homes that is air sealing or insulation. In others it is ductwork, controls, maintenance, or aging equipment. This guide puts low-cost checks first and explains when A.J. LeBlanc Heating or an NHSaves energy assessment can help identify the larger opportunity.

Low-cost checks and habits

Change your air filter on schedule

A clogged filter restricts airflow, makes the system work harder, and can cause a furnace to overheat or an AC coil to freeze. Replacement is the cheapest energy-saving step available.

• Check 1-inch filters monthly; replace every three months
• 4 to 5-inch media filters last six to twelve months
• Pets, renovation, and continuous fan operation shorten the interval

Use a programmable or smart thermostat properly

If you already have a smart thermostat, use it. An 8 to 10 degree setback for 8 hours overnight or during work hours saves up to 8 to 10 percent on seasonal heating costs. The savings only happen if you actually follow the schedule rather than overriding it every day.

Seal obvious air leaks

Common New Hampshire leak points include windows and exterior doors, the basement rim joist, recessed lights in insulated ceilings, penetrations around properly protected chimneys and flues, and exterior-wall outlets. Use materials approved for each location and keep required clearances from heat-producing equipment.

Targeted comfort and envelope improvements

Upgrade to a smart thermostat (if you don't have one)

A modern smart thermostat can improve scheduling, convenience, and control when it is compatible with the equipment and configured correctly. Savings depend on the prior schedule, system, home, and household use. Benefits may include:

• Automated setbacks that actually happen consistently
• Occupancy sensing or geofencing that runs the system less when no one is home
• Smarter staging for multi-stage or variable-speed equipment
• For heat pumps: better management of expensive auxiliary backup heat

Add attic insulation

NH homes built before the 1990s frequently have less than R-30 in the attic. Current recommendations are R-49 to R-60. Adding blown cellulose or fiberglass on top of existing insulation is straightforward, and the project is often substantially subsidized through NHSaves rebates.

Seal HVAC ducts

Leaky or poorly connected ducts can waste conditioned air and create uneven comfort. A contractor can inspect accessible ducts and, when appropriate, test the system to identify and seal meaningful leakage with approved materials.

Equipment and whole-system projects

Replace an aging furnace, boiler, or AC

An HVAC system past 15 to 20 years is running at lower efficiency than current equipment. Modern condensing furnaces and boilers reach 95+ percent AFUE; modern central AC reaches SEER2 15 to 22+. Replacing an end-of-life system with current equipment captures real efficiency gains, plus avoids the unexpected breakdown that forces a replacement on someone else's schedule.

Convert to a heat pump (or dual-fuel)

A cold-climate heat pump or dual-fuel system can reduce delivered-fuel use and add cooling. The bill impact depends on heat loss, equipment, controls, current fuel and electric prices, and the share of the heating load served by the heat pump. Use current inputs in the site's calculator.

Upgrade your water heater

A heat pump water heater can use roughly one-third of the electricity of a standard electric-resistance tank. The right comparison includes installation, location, hot-water use, operating mode, and current incentives.

Tier 4: Comprehensive (best long-term value)

Whole-home energy assessment

An NHSaves home energy assessment uses a blower door test, infrared imaging, and combustion analysis to quantify your home's actual heat loss and identify the highest-impact improvements in priority order. The cost is usually heavily subsidized, and the resulting report identifies the projects that will give your specific home the biggest return.

Comprehensive envelope-plus-equipment project

The biggest savings come from addressing the envelope (insulation, air sealing, duct sealing) AND replacing equipment in a single coordinated project. Doing them together lets you right-size the new equipment to the reduced heat loss of the improved envelope. Going equipment-first and envelope-later means oversized equipment for the rest of its life.

What to do first if you are not sure

1. Change the filter today
2. Get a programmable or smart thermostat schedule running consistently
3. Seal the most obvious air leaks (rim joist, around windows, attic penetrations)
4. Book a spring HVAC tune-up and an NHSaves home energy assessment
5. Use the assessment report to prioritize the bigger investments

Schedule an upgrade consultation

If high bills, uneven comfort, or aging equipment are pushing you toward an upgrade, A.J. LeBlanc Heating can evaluate the HVAC and plumbing equipment. An NHSaves assessment can help prioritize eligible envelope work. Together, those inputs create a more useful plan than a generic payback chart. Contact us or call 603-623-0412.

Frequently Asked Questions

What is the cheapest way to lower my energy bill?

Start with the equipment manual, a clean filter where the system uses one, practical thermostat settings, and visible air leaks that can be sealed safely. Larger comfort or energy problems deserve an assessment before money is committed.

Is a smart thermostat worth the cost?

It can be, especially when the old thermostat is not being programmed. The value depends on compatibility, prior scheduling, household use, installation cost, and current incentives.

How much can a heat pump save me?

A heat pump can reduce delivered-fuel use, but the bill impact depends on the home, equipment, controls, current energy prices, and how much of the heating load it serves. Use current inputs in the site's calculator.

What is NHSaves?

NHSaves is the brand for energy efficiency programs run by NH's electric and gas utilities. It funds home energy assessments, weatherization rebates, and equipment incentives. Many of the larger HVAC upgrades qualify for substantial rebates.

Should I replace my HVAC before or after sealing my house?

Ideally as part of the same coordinated project. Sealing first reduces the home's heat loss, which lets you size the new equipment correctly. Replacing equipment first means you may have oversized it for the home's improved envelope.