Hyrum Reservoir Area Humidity Control — Lakeside Subdivision Home, July 2024
This case study documents a comprehensive humidity control project for a Hyrum subdivision home adjacent to Hyrum Reservoir. The home had experienced substantial basement moisture concerns over multiple years due to the lakeside location, water table proximity, and substantial summer humidity load. The homeowners had tried portable dehumidifiers without satisfactory results; the comprehensive whole-home dehumidifier installation integrated with HVAC operation produced substantially better results at modest project cost.
Initial Concern
Homeowner consultation: “Our basement has had moisture issues since we moved in 5 years ago. We’ve been running two portable dehumidifiers down there but they can’t keep up during summer and we’re constantly emptying water buckets or dealing with the hoses. The relative humidity stays around 65–75% in the basement which is too high. The main floor isn’t great either — we’ve had to throw away a few items from the basement due to mold concerns. Living near Hyrum Reservoir is wonderful but the humidity is a real challenge.”
Property Context
- Home: 2,400 sq ft 3-bedroom 2.5-bath split-level home, 2008 construction; substantial subdivision lot adjacent to Hyrum Reservoir
- Location: Hyrum subdivision approximately 600 feet from reservoir shoreline; valley floor elevation approximately 4,615 feet
- HVAC equipment: 2008 Carrier 90% AFUE 80 kBTU gas furnace; matched 2008 Carrier 13 SEER 2.5-ton AC; 16 years at service; equipment approaching but not yet at end-of-life
- Existing IAQ: Basic 1” MERV 8 filter; no humidity control equipment
- Basement: 1,150 sq ft partial finished basement with substantial moisture concerns; visible mineral efflorescence on concrete walls; modest musty odor; substantial humidity affecting upstairs spaces through stack effect
- Humidity baseline measurements: Basement RH 65–75% summer (substantially above 40–55% recommended); main floor RH 52–62% summer (above 40–50% recommended); modest variation by weather and time of day
- Existing dehumidification: Two portable dehumidifiers (50-pint and 30-pint capacity) running continuously in basement; emptying water buckets daily; substantial homeowner effort with limited results
- Water table consideration: Reservoir-adjacent properties have substantially elevated water tables; foundation moisture exposure produces substantial baseline humidity load that’s not present in typical inland subdivision homes
Assessment
- Moisture source analysis: Foundation moisture migration (water table proximity); summer outdoor humidity infiltration (substantial during humid weather periods); modest evapotranspiration from substantial outdoor irrigation during summer (lawn and garden close to home); cumulative moisture load substantially exceeds typical inland subdivision baseline
- Capacity calculation: Practical dehumidification capacity requirement calculated at approximately 95–120 pints/day for adequate basement and main floor humidity control; the existing 80-pint combined portable capacity was substantially inadequate for the load
- Why whole-home vs. portable approach: Whole-home dehumidifier integrated with HVAC ductwork distributes dehumidified air throughout home (vs. portable units affecting only the room they’re in); substantially larger capacity than portable units; condensate drainage to building drainage (vs. portable bucket emptying); set-and-forget operation through humidistat (vs. ongoing portable maintenance)
- Equipment selection: Aprilaire 1850F whole-home dehumidifier (95 pints/day capacity at AHAM rating; substantially higher at the warmer basement conditions); installed in supply ductwork; humidistat-controlled operation independent of cooling cycle; sized appropriately for the load
- Existing equipment integration: 2008 Carrier equipment has substantial remaining service life (typical 18–22 year service life); integration with existing equipment appropriate; the dehumidifier installation doesn’t require equipment replacement
- Foundation moisture mitigation consideration: Some foundation moisture sources could be addressed through separate basement waterproofing work; recommended consultation with basement waterproofing specialist for assessment of foundation crack sealing, exterior drainage, sump pump operation; this is outside Velox scope but recommended as complementary work
Installation Work
- Equipment placement — Aprilaire 1850F positioned in mechanical room near furnace; appropriate clearances; access for service
- Ductwork integration — supply duct connection to existing supply trunk for dehumidified air distribution throughout home; return duct connection to existing return for dehumidifier intake; appropriate sealing and integration
- Humidistat installation — humidistat sensor placed in basement (primary moisture concern location); appropriate wiring to dehumidifier control; humidistat configuration for target 45–55% RH range
- Electrical service — new dedicated 120V/15A circuit from main panel to dehumidifier; appropriate code-compliant installation
- Condensate drainage — drainage routing to building drainage; appropriate slope and trap configuration; condensate pump if needed (not required here due to drainage slope availability)
- Filter installation — dehumidifier filter installation; filter change schedule established (6-month interval typical)
- Commissioning — equipment operation verification; humidistat operation verification; dehumidified air distribution verification at supply registers; initial humidity measurement baseline
- Hyrum permit inspection — mechanical and electrical inspections completed
- Homeowner orientation — equipment operation, humidistat settings, filter change schedule, expected performance, recommended ongoing humidity monitoring
Cost and Documentation
- Aprilaire 1850F whole-home dehumidifier: $2,485
- Ductwork integration and installation: $985
- Electrical service (new dedicated circuit): $385
- Humidistat and controls: $185
- Condensate drainage: $145
- Hyrum permit: $145
- Sales tax: $245
- Total project cost: $4,485 (rounded; actual $4,575 with coordination credits)
- Payment: Credit card upon completion
- Documentation: Project documentation including equipment specifications, baseline humidity measurements, recommended ongoing maintenance schedule
Outcome
- Humidity dramatically improved — basement RH declined from 65–75% baseline to 42–48% with dehumidifier operation; main floor RH stabilized at 40–48%; substantial improvement matches recommended ranges
- Musty odor eliminated — substantial improvement within 2–3 weeks of operation; ongoing fresh basement air quality
- Comfort improvement — lower humidity makes the home feel substantially cooler at the same temperature; family reported temperature setpoints could be raised 1–2°F with equivalent comfort (modest additional cooling cost savings)
- Mold concern resolution — the substantial humidity reduction eliminated biological growth conditions; no further mold concerns reported through subsequent 12+ months of operation
- Portable dehumidifier elimination — the two portable units removed; no further bucket emptying or hose management required; substantial quality-of-life improvement
- Equipment operation pattern — dehumidifier operates approximately 6–8 hours daily during peak summer months; modest 2–4 hours daily during shoulder seasons; minimal operation during winter (when low outdoor humidity provides natural baseline reduction)
- Electricity consumption — estimated 145–185 kWh/month additional consumption for dehumidifier operation during peak summer; modest additional cost approximately $18–$23/month; substantially less than running 2 portable dehumidifiers continuously
- Subsequent basement waterproofing — homeowner consulted with basement waterproofing specialist and completed exterior drainage improvements in fall 2024 (approximately $3,485 separate project); the combined effort addresses both moisture infiltration and humidity load comprehensively
- Homeowner satisfaction — substantial positive feedback; the comprehensive humidity control addressed years of frustrating partial solutions
Reflection on This Case
This case illustrates the substantial value of whole-home dehumidification for properties with substantial moisture loads: reservoir-adjacent and lakeside Cache Valley properties (Hyrum Reservoir, Cutler Reservoir, Newton Reservoir) experience substantial elevated moisture loads vs. typical inland properties; portable dehumidifier approaches don’t scale to address substantial loads; integrated whole-home dehumidification with HVAC distribution provides substantially better outcomes at modest project cost. The honest framing for Cache Valley homeowners with similar moisture concerns: assess the moisture sources (foundation infiltration, outdoor humidity, indoor moisture generation) before equipment selection; portable dehumidifiers may be adequate for modest loads in modest spaces but are substantially inadequate for substantial loads in larger spaces; whole-home equipment integrated with HVAC distribution is the appropriate approach for substantial loads. The complementary basement waterproofing work (separate contractor) addresses moisture infiltration at the source rather than just managing the symptoms; this combined approach is substantially more effective than either approach alone. For Hyrum Reservoir-adjacent properties, this case study illustrates the practical scope and substantial benefits; the additional capital cost ($4,485) is modest compared with the substantial quality-of-life improvement and the reduction in ongoing maintenance burden from portable dehumidifier operation. The water table consideration is real for properties this close to substantial water bodies; understanding the moisture sources helps inform appropriate equipment sizing and complementary scope. We approach reservoir-adjacent property HVAC service with appropriate consideration of the substantial moisture load characteristic of these locations.
Related Services and Resources
- Whole-home dehumidifier service
- Indoor air quality overview
- Hyrum general HVAC service
- Comfort Club maintenance plans
- Duct cleaning service
- All case studies
Contact Velox Heating and Air
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