Website Case Study: Solving a Buried Structural Airflow Challenge and Exorbitant Winter Heating Bills in Piatt County

The Realities Facing the Home

This Piatt County property was up against severe, long-term comfort issues. Some rooms were always too hot, others were freezing, and the house was burning through 800 to 1,600 gallons of propane a year, depending on the winter.

Before this project, the house had already been through multiple systems. Because the core mechanical issues weren’t handled, the structure suffered multiple premature blower motor failures and a cracked heat exchanger—forcing the equipment to be replaced long before its natural lifespan.

A thorough investigation revealed the underlying bottleneck: the central ductwork was significantly undersized for the total load of the home. AS well as improperly designed.Because these legacy ducts were entirely buried inside structural walls and beams, adding new duct lines or tearing the house apart was a total structural nightmare.

The “Month of Math” & Strategic Solution

Solving an ingrained, structural problem takes extreme patience and an absolute reliance on data. Working on a part-time basis with the homeowners, 100 hours of mathematical calculations were completed—checking, rechecking, and mapping out different equipment configurations solutions that would make a solid difference. Not solving every issue, but making a huge leap forward. Discussing the expectations for the finished project with the client and moving forward once all parties agree.  

The engineering math proved the home was suffering from an Adequate Exposure Diversity (AED) failure. Massive solar heat gain through specific windows created intense, localized thermal traps that a single central system could not balance without choking or short-cycling. AS well AS improperly sized and designed ductwork, which was never assembled properly!

Instead of trying to force too much capacity through restrictive, buried cavities, a precise layout was designed to split the load:

1. Load Decoupling: The specific problem rooms causing the solar spikes were completely disconnected from the central footprint.
2. Strategic Duct Redesign: The duct runs to those spaces needed dampers to adjust the airflow down to the proper FPM, and correction of the cfm was needed for those runs, while now sending that airflow to other rooms that had little to none. This mathematically lowered the CFM demand on the central system, bringing the remaining buried ductwork into alignment with the rest of the house.

Technical Execution & Stewardship

Bringing this property to full electrification required 12 days of deliberate on-site execution, plus 3 days of stopped work due to missing parts on the new equipment. and a serious dedication to equipment longevity:

• Zoned Inverter Systems: Two high-efficiency GE heat pump outdoor units were set up. One runs a central indoor air handler for the main body of the house. The second unit runs a high-efficiency two-head mini-split system to independently manage the climate in the decoupled rooms.
• Sub-Zero Capability: This inverter system is engineered to keep the home perfectly warm down to -5°F while maintaining a minimum COP (Coefficient of Performance) of almost 2. That means even in sub-zero weather, for every $1$ watt of electricity the system takes in, it delivers nearly $2$ watts of heat into the cold temperatures, while close to $4$ watts of heat on mild days.
• Non-Proprietary Engineering: These GE systems are deliberately utilized because they are built on non-proprietary technology. The unique logic controls give the system its high-efficiency capabilities, but the core parts are non-restrictive, meaning any skilled heat pump contractor can work on them down the road.
• Complete Infrastructure Upgrades: The project required a full electrical panel upgrade, routing new line sets between the first and second floors, and adjusting the filter boxes to reduce static pressure and improve indoor air quality. Every single exterior foundation penetration was structurally sealed with clean mortar coverage.

The Cost of Precision: Doing this type of correction right requires a realistic investment. The project took about a month of total configuration time and a capital investment equivalent to the price of an average mid-sized passenger car. Based on current utility rates, the projected return on investment sits right at ten years.

True stewardship means fixing things right, even when the unexpected happens. During unboxing, a few factory parts were found missing or broken. Instead of rushing past it, the job was paused for three days to process a full warranty claim and secure the correct pieces, ensuring the specialized internal controls remain fully adjustable for future service technicians. All accessible legacy flexible lines were also sealed with mastic at no extra charge.

The Verified Results

The 1,000-gallon propane tank is being completely removed. The home is now fully electric, entirely free from delivered fuel markets, and operating in total equilibrium. The indoor environment stays at a rock-solid, steady 68°F baseline from room to room, completely backed by mechanical math.