CASE STUDY 4

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 Targeted systems upgrade with durable finishes, right-sized mechanicals, and rural utility integration (well & septic) 

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Upgrade an existing single-family residence to achieve improved energy efficiency, durability, and occupant comfort while working within the constraints of a well and septic system. The remodel emphasizes reduced operational demand, resilient assemblies, and long-life finishes considered appropriate for semi-rural conditions and variable soil moisture.

Older residential structure with dated interior finishes
Legacy mechanical systems with limited efficiency and uneven comfort
Exterior site served by private well and septic, requiring attention to water demand and fixture selection
Existing mature trees and established grade limiting large exterior disturbance 

Interior remodel including kitchen and living spaces
Exterior finish completion and porch detailing
Mechanical system replacement with efficiency-focused equipment
Plumbing upgrades aligned with low-flow standards
Electrical and lighting updates to reduce internal loads
Defined exterior transitions without altering primary grading 

Air Sealing (Opportunistic Retrofit)

Air sealing was completed in all accessible locations exposed during interior work.

Key areas addressed:

Rim/band joists at basement or crawlspace perimeter
Top plates and attic penetrations accessed during ceiling work
Plumbing and electrical penetrations behind cabinets and fixtures
Exterior wall penetrations sealed during finish installation

Purpose:

Reduce uncontrolled air exchange that drives energy loss, dust infiltration, and seasonal comfort swings.

Insulation improvements focused on zones with the highest return and lowest disruption.

Attic plane:
Air sealed, then supplemented with blown insulation to improve thermal continuity

Rim/band joists:
Closed-cell spray foam or rigid foam board with sealed edges to stop air leakage and condensation risk

Walls opened during remodel:
Mineral wool batts installed for moisture tolerance, fit, and acoustic benefit

These upgrades reduce heating and cooling loads without invasive full-envelope reconstruction.

Where exterior elements were completed or replaced:

Proper flashing integration at window and door openings
Sealed rough openings to maintain air and water control continuity
Exterior finishes selected for durability and reduced maintenance in a wooded environment

Porch steps and railings were installed to provide durable access while maintaining clear separation between structure and landscape.

HVAC Strategy 

Based on post-air-sealing conditions typical of remodeled homes in the 2,000–2,800 sq ft range in Maryland, the system was selected to prioritize efficiency and comfort rather than oversizing.

Specified approach:

High-efficiency heat pump, typically in the 2.5–3.5 ton range depending on final load calculations
Variable-speed or multi-stage operation preferred to:
Improve humidity control
Reduce cycling losses
Maintain even room temperatures

Advantages over lower-cost, oversized systems:

Lower operating energy
Improved dehumidification in mixed-humid conditions
Reduced noise and wear
Better real-world efficiency versus nameplate ratings alone

Distribution and Controls

Duct sealing at all accessible joints using mastic
Balanced supply and return airflow to reduce hot/cold spots
Modern thermostat controls to support modulation and scheduling

As air leakage was reduced, ventilation became intentional rather than incidental.

Dedicated bath exhaust with sealed, smooth duct runs to exterior
Kitchen ventilation vented outdoors rather than recirculating
Filtration upgraded where system static pressure allowed (typically mid-to-high MERV range)

Efficiency-focused replacement:

High-efficiency electric water heater, with heat pump water heater used where space and layout allowed

Technical advantages:

Reduced energy consumption compared to resistance-only systems
Lower peak electrical demand
Improved operational cost stability over time

Water efficiency was a core consideration due to private utility systems.

Installed fixtures include:

1.28 gpf toilets (high-performance low-flow)
1.5 gpm bathroom faucets

Water-efficient shower fixtures maintaining pressure while reducing flow

Benefits:

Reduced draw on well system
Lower hydraulic loading on septic field
Extended service life of private wastewater infrastructure