You feel a draft by the floor in January, and someone tells you to add insulation. Someone else says seal the cracks first. Both jobs cut your bill, but the two jobs do very different things, and the order matters more than most homeowners hear. Novus Mechanical works on older homes across Monmouth County, NJ, and the honest answer is that air sealing plus insulation together saves about 15% on heating and cooling, according to ENERGY STAR.
Here is the short version. Air sealing stops air from leaking through cracks and gaps. Insulation slows heat from passing through the walls and attic. Insulation laid over a leaky house underperforms, so the smart move is to seal the leaks first, then insulate. We measure where the air actually moves using Retrotec gauges, so the sealing is aimed at real gaps instead of guesswork. For example, a 1970s ranch around Freehold often hides its worst leaks in the attic. A blower door test from Novus starts at $350.
Air sealing is the work of closing the cracks and gaps where outside air leaks into a house, and insulation is the material that slows heat from passing through walls and attics. The two jobs sound alike, but each fixes a separate problem. Air leaks move whole streams of hot or cold air through the building, around wires, pipes, and the attic hatch. Heat transfer is slower and quieter, soaking through the walls all day. First, air sealing plugs the holes. Second, insulation slows what is left. A house needs both, in that order, to hold a steady temperature. Skip the sealing and outside air pours past the insulation, undoing the work. Sealing the leaks and insulating together saves about 15% on heating and cooling, according to ENERGY STAR. Novus measures the leaks first using Retrotec gauges, so the plan fits the actual house.
You seal the air leaks first because insulation laid over a leaky shell underperforms, sometimes badly. Most attic insulation slows heat, but most attic insulation does not stop moving air. Picture a wool sweater on a windy day: the sweater traps warmth until the wind blows straight through, and then the warmth is gone. A leaky attic works the same way, and air pushes past loose insulation and carries the heat out. First, we measure the leaks using Retrotec gauges. Second, Novus seals the gaps, then adds insulation on top of the sealed surface. Done in that order, the insulation finally does the job the homeowner paid for. Sealing plus insulating saves about 15% on heating and cooling, according to ENERGY STAR. For example, a 1970s ranch around Freehold often hides its worst leaks in the attic. A blower door test from Novus starts at $350.
A blower door test is a measured way to find air leaks, and the test pulls air out of the house to expose every gap at once. A calibrated fan mounts in an exterior doorway and lowers the indoor pressure. With the pressure dropped, outside air rushes in through every crack, so the leaks are easy to track. First, we run the blower door test using Retrotec gauges. Second, we measure the whole-house leakage in CFM50. Third, we walk the house and mark each spot where air pours in. The result is a real map, not a guess, so the sealing work hits the gaps that matter. Sealing those gaps lowers the home's load, so the result also feeds the Manual J load calculation and lets a new system be right-sized smaller. Older homes around Freehold often leak most at the attic, the rim joist, and around old windows. The CFM50 number also tells you how tight the house is, and a good blower door score is the target to seal toward. A blower door test from Novus starts at $350, and the test turns sealing into targeted work.
Neither air sealing nor insulation wins alone, because the two save the most money working together, not apart. Air sealing alone leaves heat soaking through bare walls. Insulation alone lets outside air blow past the new material. Sealing plus insulating saves about 15% on heating and cooling, according to ENERGY STAR, and that pairing is where the real savings live. The bigger return usually starts with air sealing, because plugging the leaks is cheaper and stops the largest waste first. First, we measure the leaks using Retrotec gauges. Second, we seal the worst gaps. Third, we bring the insulation up to where the climate needs it. Monmouth County sits in Climate Zone 4A, where winter design temperatures drop to 13 degrees, so a tight, well-insulated shell earns its keep every cold month. A home energy audit ties the whole plan together.
Novus plans air sealing and insulation as one measured job, not two guesses, and the plan runs in five steps. A blower door test from Novus starts at $350 and anchors the whole plan. Here is how Novus does the work across Monmouth County.
That last step matters, because a tighter home changes how the heating and cooling system runs, which is why we seal the envelope before or alongside a central AC replacement so the new system fits the sealed house. Sealing plus insulating saves about 15% on heating and cooling, according to ENERGY STAR. A home energy audit pulls the findings into one clear plan.
Air sealing and insulation are both important, but air sealing usually comes first because insulation over a leaky house underperforms. Air sealing stops whole streams of outside air from leaking through cracks. Insulation slows the slower heat that soaks through walls and attics. A house needs both jobs to hold a steady temperature, and the order matters. First, Novus seals the gaps using a measured plan. Second, Novus adds insulation on top of the sealed surface. Sealing plus insulating saves about 15% on heating and cooling, according to ENERGY STAR. We measure the leaks first using Retrotec gauges, so the sealing hits real gaps and not guesses. A 1970s ranch around Freehold often leaks worst at the attic. A blower door test from Novus starts at $350, and the test points the work where the savings are.
No, adding more insulation while skipping air sealing wastes money, because most insulation slows heat but does not stop moving air. Picture a thick blanket on a windy night: the blanket holds warmth until the wind blows through, and then the warmth is gone. A leaky attic does the same, and air pushes past the insulation and carries the heat out. First, Novus seals the gaps and penetrations. Second, Novus adds insulation over the sealed surface. Done in that order, the insulation finally performs, the same sequence the Department of Energy lays out for insulating a home. Sealing plus insulating saves about 15% on heating and cooling, according to ENERGY STAR. We measure the leaks first using Retrotec gauges. A blower door test from Novus, across Monmouth County, starts at $350, so the dollars go to the gaps that matter most.
Novus finds air leaks with a blower door test, a measured method that pulls air out of the house to expose every gap at once. A calibrated fan mounts in an exterior doorway and lowers the indoor pressure. With the pressure dropped, outside air rushes in through every crack, so the leaks are easy to track. First, we run the blower door test using Retrotec gauges. Second, we measure whole-house leakage in CFM50. Third, we walk the home and mark each leak. The result is a real map of the gaps, not a guess. Older homes around Freehold leak most at the attic, the rim joist, and old windows. The Department of Energy flags those same spots as the first places to seal. A blower door test from Novus starts at $350, and sealing plus insulating saves about 15% on heating and cooling, according to ENERGY STAR.
Air sealing and insulation together save about 15% on heating and cooling, according to ENERGY STAR, when the two jobs are done as one plan. The savings come from stopping the leaks and slowing the heat at the same time. Air sealing alone leaves heat soaking through bare walls. Insulation alone lets outside air blow past the new material. First, Novus measures the leaks using Retrotec gauges. Second, Novus seals the worst gaps. Third, Novus brings insulation up to the level Climate Zone 4A needs. Monmouth County winters drop to a 13 degree design temperature, so a tight, well-insulated home pays off all season. A blower door test from Novus starts at $350, and the test turns the savings estimate into a real, targeted plan for your house.
Yes, air sealing helps with summer cooling, because the same gaps that leak heat out in winter let hot, humid air in during July. A leaky home forces the air conditioner to fight outside air all day, and the system runs longer and costs more. Sealing the gaps keeps the cooled air inside where it belongs. First, Novus measures the leaks using Retrotec gauges. Second, Novus seals the worst gaps. Third, Novus checks the cooling system using MeasureQuick. Monmouth County summers hit a 91 degree design temperature, so a sealed home holds comfort far better through a heat wave. Sealing plus insulating saves about 15% on heating and cooling, according to ENERGY STAR. A blower door test from Novus starts at $350, and a sealed, insulated home runs cooler for less every summer.
We measure your home, explain what we find, and hand you one clear price. Book a consultation in Freehold or Monmouth County.
