Case Study: Multi-Zone Ductless Installation in a 1905 Windsor Tobacco Farmhouse
This case study documents a 2025 multi-zone ductless mini-split installation in a 2,200 square foot 1905 farmhouse in Windsor's Poquonock neighborhood. The home, originally built by tobacco farmers, retains substantial agricultural character from the Connecticut River Valley's shade tobacco era (1890s-1960s). Like many farmhouses of the period, it had hot-water hydronic heating with cast iron radiators but no ductwork; window AC units served cooling needs for over 30 years. The project added Fujitsu Halcyon multi-zone ductless cooling and supplementary heating, preserving the original radiator distribution while adding modern cooling capability throughout the home.
Customer Situation
The homeowners had owned the 2,200 square foot 1905 farmhouse for 11 years:
- Existing equipment: 2015 Burnham Series 2 oil-fired hot-water boiler (10 years old, well-maintained, in good condition); 11 cast iron radiators across 2 floors plus basement; no existing ductwork; no central cooling.
- Original cooling approach: 4 window AC units in primary bedrooms and living room; oscillating fans in other spaces; substantial summer comfort variation across rooms; aesthetic and noise concerns; annual setup/teardown labor.
- Property characteristics: 1905 farmhouse with original front porch, wrap-around porch addition (1920s), and detached barn (now used as workshop); 4-acre lot with established gardens; mature trees around home.
- Tobacco farming heritage: Original home built by tobacco farming family during peak Connecticut River Valley shade tobacco era; original outbuildings included tobacco curing barns (one preserved on property); architecture reflects rural prosperity of the period.
- Customer priorities: Add convenient whole-home cooling without disrupting existing heating system; preserve original radiator distribution and historic character; address summer comfort issues affecting home enjoyment; supplementary heating for transition seasons (April-May, September-October) when boiler operation cycles inefficiently.
- Local historic district: Poquonock area has local architectural review for some changes but generally less restrictive than Palisado Avenue district; outdoor equipment placement coordination required.
Diagnostic Visit and Equipment Selection Considerations
April 2025 consultation visit:
- Manual J cooling load calculation: 30,000 BTU/hr cooling load at Hartford 88°F/73°F summer design conditions; distributed across home zones.
- Existing heating system retention: Burnham Series 2 boiler in good condition; 10 years old with substantial remaining life; logical retention as primary heating; ductless system provides supplementary capability for shoulder seasons.
- Distribution analysis: No existing ductwork; conventional central AC installation would require substantial ductwork installation ($8,000-$14,000 additional cost); ductless mini-split avoids this expense entirely.
- Multi-zone distribution: Home naturally divides into 4 distinct zones: first-floor living areas (1 main zone), kitchen, master bedroom, additional bedrooms; multi-zone approach matches home layout.
- Outdoor unit location: Side yard location away from porch areas; coordinated with existing landscape; minimal aesthetic impact.
- Indoor unit aesthetics: Wall-mounted indoor units selected for ceiling height considerations; modern slim profiles minimize visual impact; ceiling cassette considered for some zones but wall-mounted preferred for historic interior aesthetic.
- Brand selection: Customer evaluated Mitsubishi, Daikin, and Fujitsu options; Fujitsu Halcyon selected for: competitive pricing, established Connecticut service network, equipment availability, customer preference for the brand based on prior experience with other Fujitsu products.
- Electrical service: 200A service from 2018 upgrade; adequate for ductless system addition; dedicated 240V circuit for outdoor unit.
Solution Scope and Equipment Selection
Equipment Selected
- Fujitsu Halcyon 36RLXFZ multi-zone outdoor unit: 3-ton (36,000 BTU/hr) cooling capacity; variable-speed inverter compressor; HSPF2 9.5, SEER2 21.0; cold-climate rated for supplementary heating to −5°F; supports up to 5 indoor units.
- 4 Fujitsu Halcyon indoor wall-mounted units:
- Living/dining area unit: 12,000 BTU/hr (1-ton) capacity
- Kitchen unit: 9,000 BTU/hr (0.75-ton) capacity
- Master bedroom unit: 9,000 BTU/hr (0.75-ton) capacity
- Additional bedroom unit: 9,000 BTU/hr (0.75-ton) capacity
- Fujitsu wall controls (4 zones): Wall-mounted controllers per indoor unit; individual temperature control per zone.
- Refrigerant lineset routing: Outdoor unit to indoor units via refrigerant linesets through wall and ceiling spaces; total lineset length approximately 140 feet across 4 zones.
- Boiler integration: Existing Burnham Series 2 oil-fired boiler retained for primary winter heating; ductless system provides cooling and supplementary heating for transition seasons.
- Electrical infrastructure: Dedicated 240V 30A circuit for outdoor unit; standard installation.
- Coordinated thermostat strategy: Existing radiator thermostat unchanged for boiler control; ductless system has its own per-zone controls; customer manually transitions between heating sources during shoulder seasons.
Installation Process
Project completed May 2025 over 4 working days:
- Day 1: Outdoor unit pad preparation and placement; electrical circuit installation; outdoor unit installation.
- Day 2: Refrigerant lineset routing through wall and ceiling spaces; coordinated with existing electrical and plumbing; minimal interior disruption.
- Day 3: Indoor unit installation across 4 zones (one zone per work session); each unit mounting, refrigerant connections, control wiring; coordinated with customer access requirements.
- Day 4: System fill and refrigerant charging; pressure testing; commissioning at all 4 indoor units; customer walkthrough and training on Fujitsu controls.
Results
System operating since May 2025. Summer 2025 cooling performance documented:
- Whole-home cooling achieved: 4 zones provide whole-home cooling coverage; substantial improvement over 4 window AC units serving only specific bedrooms and living room.
- Cooling-season energy use: Estimated $420 cooling-season electrical cost for summer 2025 (vs. estimated $640-$760 with previous 4 window AC arrangement); 38-44% reduction.
- Comfort improvement: Even temperature distribution throughout home; previously uncooled rooms (dining room, second-floor home office, additional bedrooms) now comfortable.
- Variable-speed comfort: Variable-speed inverter operation provides excellent humidity control and stable temperatures; quieter operation than window AC.
- Window restoration: Window views restored; aesthetic improvement substantial.
- Shoulder season heating use: Customer began using ductless system for supplementary heating during cooler April and September days; reduced unnecessary boiler operation during low-demand periods; estimated $180 additional annual savings.
- Reliability: No service issues during first summer; quiet, reliable operation across all 4 zones.
Investment Summary
- Fujitsu Halcyon 36RLXFZ multi-zone outdoor unit: $4,800
- 4 Fujitsu Halcyon indoor wall-mounted units: $5,200
- Wall controls (4 zones): $640
- Refrigerant linesets, insulation, fittings: $2,400
- Electrical work (dedicated 240V circuit): $640
- Window AC removal and disposal: $185
- Installation labor (4 days, 2 technicians): $5,600
- Permit and inspection coordination: $280
- Outdoor unit pad and miscellaneous: $440
- Total project cost: $20,185
- Eversource ductless mini-split rebate: −$800
- Eversource multi-zone bonus: −$400
- Federal IRA 25C tax credit (30% capped at $2,000): −$2,000
- Net customer investment: $16,985
- Estimated annual energy savings: $400 (combined cooling efficiency improvement and shoulder season heating savings)
Lessons Applicable to Other Farmhouse and No-Ductwork Properties
- Ductless mini-splits ideal for homes without existing ductwork: Avoids substantial ductwork installation cost ($8,000-$14,000); preserves historic interior aesthetics; faster installation than ductwork addition.
- Multi-zone approach matches home layout: Naturally distinct rooms in older homes (living areas, kitchen, master, bedrooms) align with multi-zone configurations; individual zone control valuable for varied use patterns.
- Brand variety provides options: Mitsubishi, Daikin, Fujitsu, LG, Samsung all offer competitive multi-zone equipment; customer choice based on local service network, equipment preferences, and pricing.
- Hybrid heating approach often optimal: Existing hydronic heating retained for severe cold; ductless system provides cooling and supplementary heating for shoulder seasons; combines reliability with efficiency.
- Indoor unit aesthetics matter: Wall-mounted units, ceiling cassettes, ducted indoor units all available; customer preference for historic interior aesthetics often favors wall-mounted; ceiling cassettes sometimes appropriate.
- Refrigerant lineset routing flexibility: Indoor units can be located substantially distant from outdoor unit; routing through walls and ceiling spaces; substantial installation flexibility.
- Quieter than window AC: Modern variable-speed inverter compressors substantially quieter than window AC; both outdoor and indoor sound levels improved.
Frequently Asked Questions
- What's the Connecticut River Valley tobacco farming heritage?
- The Connecticut River Valley had substantial shade tobacco farming from the 1890s through the 1960s. Specifics: (1) Shade tobacco: leaves grown under cheesecloth shade structures to produce thin, large leaves for cigar wrapper applications. (2) Geographic concentration: Windsor, East Hartford, Suffield, Granby, Bloomfield, and adjacent communities had concentrated tobacco operations. (3) Farm architecture: substantial farm complexes with main farmhouse, multiple tobacco curing barns, equipment storage, and worker housing. (4) Agricultural prosperity: tobacco farming generated substantial wealth in valley communities during peak periods. (5) Worker housing: substantial seasonal workforce produced specific housing patterns including some imported workers from Puerto Rico and elsewhere. (6) Decline: tobacco industry declined substantially in 1960s-1970s as alternative crops and tobacco regulation affected industry economics. (7) Architectural legacy: many original farmhouses and outbuildings remain throughout Connecticut River Valley communities. (8) Connecticut Historical Society and local historical societies document substantial materials about valley tobacco era. (9) Modern interpretation: some original tobacco farms preserve outbuildings as historical artifacts; some have repurposed structures for residential or commercial uses. The agricultural heritage substantially shapes architecture and community character throughout Windsor and adjacent communities.
- How does ductless mini-split work for homes without existing ductwork?
- Excellent option. How ductless works: (1) Outdoor unit: contains compressor, fan, and outdoor heat exchanger; single unit can serve multiple indoor zones. (2) Indoor units: wall-mounted, ceiling cassette, ducted (mini-duct), or floor-mounted configurations; each serves a distinct zone. (3) Refrigerant linesets: connect outdoor unit to indoor units via insulated copper tubing; routed through walls and ceiling spaces; no ductwork required. (4) Individual zone control: each indoor unit has its own wall controller; independent temperature setting per zone. (5) Variable-speed operation: modern systems modulate capacity 25-100%; precise temperature control. (6) Both cooling and heating: heat pump capability provides cooling in summer, heating in winter (or supplementary heating with existing primary system). (7) Quiet operation: outdoor and indoor units substantially quieter than alternative systems. (8) Cost comparison: ductless system $15,000-$25,000 vs. conventional ductwork installation $25,000-$40,000+ for equivalent capacity; substantially less expensive for ductwork-less homes. (9) Aesthetic considerations: wall-mounted units visible in rooms; some customers prefer ceiling cassettes for less visible installation. (10) Maintenance: similar to other heat pumps; annual professional service plus regular filter changes.
- How does multi-zone ductless compare to single-zone or central system?
- Comparison across approaches. (1) Single-zone ductless: one outdoor unit serves one indoor unit; appropriate for cooling specific room or area; less expensive but limited to single zone; $4,000-$8,000 typical project cost. (2) Multi-zone ductless (this case study's approach): one outdoor unit serves 2-8 indoor units; individual zone control; provides whole-home cooling without ductwork; $12,000-$28,000 typical project cost depending on zone count. (3) Conventional central AC with new ductwork: $25,000-$45,000 total project cost when ductwork must be added to no-ductwork home; substantial premium. (4) Conventional central AC with existing ductwork: $6,000-$16,000 project cost when ductwork can be retained; this case study approach for East Hartford Cape Cod. (5) High-velocity small-duct (SpacePak): alternative for homes where conventional ductwork doesn't work but ductwork is preferred; $20,000-$30,000+. (6) Geothermal heat pump: $55,000-$95,000+; substantial premium but exceptional efficiency. For homes without existing ductwork, multi-zone ductless typically optimal balance of cost, comfort, and installation feasibility.
- What are advantages of using existing hydronic heating with new ductless cooling?
- Multiple benefits from hybrid approach. (1) Existing investment preservation: existing boiler and radiator distribution typically substantial investment; no premature replacement. (2) Distribution preservation: original cast iron radiators are historic architectural features; preserving avoids interior disruption. (3) Heating reliability: hydronic heating particularly reliable for severe cold; ductless cooling addition complements rather than replaces. (4) Shoulder season optimization: ductless system can provide supplementary heating during shoulder seasons (April-May, September-October) when boiler operation cycles inefficiently. (5) Reduced equipment investment: ductless adds cooling capability without requiring complete heating system replacement; substantially lower investment than complete electrification. (6) Backup heating capability: existing primary heating provides backup if ductless system has issues; vice versa for severe cold. (7) Aesthetic continuity: existing radiators preserved alongside modern ductless equipment; historic and modern coexisting. (8) Cost-effectiveness: hybrid approach often substantially less expensive than complete HVAC system replacement. (9) Customer choice: customer can choose comprehensive electrification later; hybrid approach is reasonable middle step.
- How does Fujitsu compare to Mitsubishi and Daikin in ductless?
- All three are excellent options; customer choice based on specific priorities. (1) Mitsubishi: longest established North American ductless presence; substantial dealer network; recognized for cold-climate Hyper-Heat technology; premium positioning; substantial efficiency. (2) Daikin: rapidly expanding North American presence; competitive pricing; strong international engineering reputation; aggressive efficiency progression; growing dealer network. (3) Fujitsu: established Connecticut presence; competitive equipment; reliable performance; sometimes priced more competitively than Mitsubishi; established service network in Hartford area. (4) Specific selection factors: local service availability (all three substantial in Hartford area); customer brand preference; equipment availability and lead time; pricing competitive across brands; specific feature priorities (cold-climate performance, efficiency, control features). (5) Customer prior experience: customers with prior positive experience with specific brand often prefer continuity. (6) Contractor expertise: contractors usually develop deeper expertise in 1-2 brands; familiar brand selections produce better installation outcomes. (7) Warranty considerations: similar warranty terms across brands; sometimes specific warranty extension programs. For this case study, Fujitsu was selected based on customer preference and competitive pricing; all three brands would have produced satisfactory results.
Contact Biozura Heating and Air
For ductless mini-split consultation in Windsor and surrounding areas, contact us. Tomás Reyes leads heat pump and ductless installations. Eversource Participating Contractor #CT-EVS-22-04612. Connecticut DCP Unlimited HVAC License #S1-0414829.
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