Lakeside Property Comprehensive IAQ System — Hyrum Reservoir Custom Home, August 2024
This case study documents the comprehensive indoor air quality system installation at a substantial custom home on a Hyrum Reservoir-adjacent property. The project differs from the prior Hyrum humidity control case study (focused exclusively on dehumidification) by addressing the full range of IAQ considerations through integrated equipment: filtration, biological treatment, humidity management, and managed fresh air ventilation. The combined approach provides comprehensive indoor air quality appropriate for the substantial moisture load, summer pollen exposure, and Cache Valley inversion-period particulate considerations.
Initial Concern
Homeowner consultation: “We built this house three years ago specifically for the Hyrum Reservoir location and views, but we’ve struggled with indoor air quality concerns we hadn’t anticipated. Substantial humidity from the reservoir; substantial pollen from the surrounding agricultural area; concerning PM2.5 levels during winter inversions; my wife has asthma that’s been substantially harder to manage here. We’d like to address all of this comprehensively rather than piece by piece.”
Property Context
- Home: 3,400 sq ft 4-bedroom 3.5-bath two-story custom home with walkout basement; 2021 construction; substantial Hyrum Reservoir-adjacent property
- Location: Approximately 350 feet from Hyrum Reservoir shoreline; substantial reservoir views from primary living spaces; agricultural area surrounding property
- HVAC equipment: 2021 Carrier Infinity 96% AFUE 80 kBTU modulating gas furnace; matched Carrier Infinity 18 SEER variable-capacity 3.5-ton AC; equipment in excellent operating condition (3 years at service)
- Existing IAQ equipment: 5” MERV 11 media filter cabinet (installed during construction); no other IAQ provision
- Family considerations: Wife has asthma with substantial seasonal variation (worse during spring pollen and winter inversion periods); two school-age children; family of 4 with substantial home occupancy
- Moisture characteristics: Substantial elevated moisture load due to reservoir proximity; basement RH measuring 58–68% summer (above ideal 40–55%); main floor RH 48–58% summer (slightly above ideal)
- Pollen exposure: Substantial spring tree pollen from surrounding agricultural area; substantial fall ragweed; pollen infiltration through building envelope during high-pollen periods
- Cache Valley inversion exposure: Substantial outdoor PM2.5 elevation during winter inversions; existing MERV 11 filtration provides reasonable but incomplete particulate capture
- Asthma management: Wife’s asthma symptoms substantially worse since moving to this property vs. previous residence; medication management adequate during typical conditions but inadequate during peak exposure periods
Comprehensive IAQ Assessment
- Particulate analysis: Baseline PM2.5 in occupied spaces 14–22 µg/m³ (moderate; not severe but substantially above ideal for asthma management); elevated during pollen periods and inversion events
- Humidity analysis: Basement RH substantially elevated (58–68%) producing modest but ongoing biological growth risk; main floor RH slightly elevated (48–58%)
- Filtration upgrade potential: Existing 5” MERV 11 cabinet can accept MERV 13 or MERV 16 filters with appropriate static pressure verification; substantial filtration improvement possible without equipment replacement
- Biological consideration: Reservoir proximity and substantial humidity produce conditions favoring biological growth (mold spores, bacteria); UV light treatment appropriate
- Ventilation consideration: 2021 construction with substantial air sealing produces low natural air exchange; managed fresh air ventilation (ERV) would provide controlled outdoor air without bypassing filtration; substantial IAQ benefit
- Comprehensive scope rationale: The substantial scope (filtration upgrade, UV light, dehumidification, ERV) addresses different aspects of IAQ through complementary mechanisms; comprehensive approach provides substantially better outcomes than partial scope
Recommended Comprehensive Scope
- Filtration upgrade — replace existing MERV 11 filter with MERV 16 filter in existing 5” cabinet; substantial particulate capture improvement (99% capture of 1.0–3.0 micron particles); modest static pressure addition within equipment specifications
- UV light installation — Aprilaire 911 UV light in supply plenum; ongoing biological contamination management
- Whole-home dehumidifier — Aprilaire 1830F whole-home dehumidifier (70 pints/day capacity; smaller than the prior Hyrum case because the moisture load is more moderate at this newer-construction better-sealed home); integrated with HVAC ductwork for whole-home distribution
- Energy Recovery Ventilator (ERV) — Aprilaire 8126 ERV providing 130 CFM continuous fresh air with substantial heat recovery (75% sensible heat recovery, 50% latent heat recovery); managed outdoor air through dedicated ductwork integrated with HVAC supply
- Integrated control — coordination through existing Carrier Infinity Touch thermostat; humidistat for dehumidifier; appropriate ERV controls
Installation Work
- MERV 16 filter installation — existing 5” filter cabinet retained; MERV 16 filter installed; static pressure verification within equipment specifications
- UV light installation — Aprilaire 911 mounted in supply plenum at appropriate location; electrical service from nearby outlet; first bulb installation
- Dehumidifier installation — Aprilaire 1830F positioned in mechanical room near furnace; supply duct connection to existing supply trunk; return duct connection; humidistat sensor placed in basement (primary moisture concern); electrical service; condensate drainage
- ERV installation — Aprilaire 8126 ERV mounted in mechanical room with appropriate space; outdoor air intake and exhaust ductwork installed with proper exterior terminations; supply integration with HVAC supply ductwork; appropriate dampers and controls
- Exterior ductwork penetrations — intake and exhaust terminations installed with appropriate clearances per code (minimum separation, appropriate insect screening, appropriate hooded terminations against weather); located on north-facing wall for appropriate intake air quality
- Control integration — humidistat sensor configuration for 45–55% RH target; ERV control configuration for continuous low-speed operation with boost capability; thermostat integration verified
- Commissioning — comprehensive testing including all four systems operation, integration verification, baseline measurement comparison, homeowner orientation
- Hyrum permit inspection — mechanical and electrical inspections completed and approved
Cost and Documentation
- MERV 16 filter upgrade (cabinet retained): $145 (filter cost only; cabinet already installed)
- Aprilaire 911 UV light installation: $585
- Aprilaire 1830F whole-home dehumidifier: $2,185 (equipment)
- Dehumidifier installation labor and materials: $785
- Aprilaire 8126 ERV: $1,485 (equipment)
- ERV installation labor and materials: $885
- Exterior ductwork penetrations and terminations: $385
- Hyrum permit: $185
- Sales tax: $385
- Total project cost: $7,025 (rounded to approximately $6,485 with coordination credits)
- Annual ongoing maintenance: MERV 16 filter $95–$125 every 12–15 months; UV bulb $65–$85 annually; dehumidifier filter $25 annually; ERV filters $45 annually; approximately $235–$280 total annual maintenance
- Payment: Credit card upon completion
- Documentation: Comprehensive project documentation including equipment specifications, baseline measurements, recommended ongoing maintenance schedule
Outcome
- Particulate concentration substantially reduced — PM2.5 in occupied spaces declined from 14–22 µg/m³ baseline to 4–7 µg/m³ sustained; substantial improvement
- Asthma management substantially improved — wife reports substantial reduction in symptom severity during typical conditions; medication needs reduced during typical operation; peak exposure periods (spring pollen, winter inversions) substantially more manageable
- Humidity stabilized in appropriate range — basement RH 42–48% with dehumidifier operation; main floor RH 40–48%; substantial comfort improvement and biological growth risk reduction
- Pollen exposure reduction — indoor pollen substantially reduced through MERV 16 filtration; the ERV provides managed outdoor air through filtration rather than uncontrolled infiltration; substantial improvement during peak pollen periods
- Cache Valley inversion protection — substantial PM2.5 capture during severe inversion events; indoor air quality substantially better than outdoor conditions; substantial health benefit during peak inversion days
- Fresh air ventilation — ERV provides 130 CFM continuous fresh air vs. previous reliance on infiltration; substantially better CO2 management, odor management, indoor air freshness
- Energy impact — ERV heat recovery (75% sensible, 50% latent) substantially reduces the heating/cooling penalty from managed ventilation; modest electricity consumption for ERV operation; combined system electricity consumption increase approximately 8–12% of HVAC baseline (small fraction of total home consumption)
- Family satisfaction — substantial positive feedback regarding the comprehensive transformation; the indoor air quality improvement has materially affected family quality of life
- Allergist coordination — wife’s allergist reported substantial improvement in patient-reported symptoms; the IAQ project supplements medical management effectively
- Comfort Club enrollment covers annual maintenance of all IAQ equipment plus the existing HVAC equipment
Reflection on This Case
This case illustrates the substantial value of comprehensive IAQ systems for properties with multiple concerning factors (substantial moisture load, substantial pollen exposure, substantial inversion-period particulate exposure, family members with respiratory sensitivities): individual point solutions address single concerns but the comprehensive approach addresses all concerns through complementary mechanisms; the integrated control through the Carrier Infinity Touch thermostat ecosystem produces seamless operation without homeowner management complexity. The substantial project cost ($6,485) is modest compared with the substantial quality-of-life improvement for the family; the asthma management improvement alone justifies the investment beyond any other consideration. For other Cache Valley reservoir-adjacent properties (Hyrum Reservoir, Cutler Reservoir, Newton Reservoir) and other Cache Valley properties with substantial agricultural area pollen exposure, this case study illustrates the practical scope of comprehensive IAQ systems. The honest framing for Cache Valley homeowners considering similar projects: comprehensive scope is appropriate when multiple concerns exist; partial scope is appropriate when single concerns dominate; we discuss appropriate scope at consultation based on actual household situation and priorities. The 2021 construction date of this home reflects modern building practices with substantial air sealing; this is increasingly common for Cache Valley new construction and the ERV addition is increasingly important for these well-sealed homes to manage indoor air quality without uncontrolled infiltration; this consideration extends to other newer Cache Valley homes throughout the region. The combined approach (filtration + UV + dehumidification + ERV) is the appropriate comprehensive solution; alternative approaches (any single component) would have provided substantially less benefit at not-substantially-less cost.
Related Services and Resources
- Indoor air quality overview
- Air purifier installation
- Whole-home dehumidifier service
- UV light treatment
- Hyrum general HVAC service
- All case studies
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