Hybrid central heating and cooling (cont.) High air velocity and narrow duct type. Attic or basement mounted modular system. Cooling is with a R22 refrigerant-charged A/C unit. Heating is with an electric hot water heating system. Rated at 13 SEER (Seasonal Energy Efficiency Rating). Provides precision zone control and low humidity for retrofit projects required to meet high energy-efficiency performance standards. Includes automatic mode switchover, individual zone digital thermostats, digital main controller module, transition-mounted duct fans and motor drive, hot water coils and a circulating pump mounted in the air handling unit. Designed for HVAC upgrades of historic buildings, condo conversions and for meeting stringent indoor air quality and occupant comfort standards. See central air filter systems in the section that follows. Add the cost of a hot water expansion tank. Add the cost of equipment rental, if required: an appliance dolly ($14 per day), a 3,000 lb. come-a-long ($16 per day) and a 1-ton chain hoist ($21 per day).
Installation for hybrid central heating
  Reinforce joists in an attic B1@3.00 LS 474.00 99.90 573.90
  Place two vibration pads CF@.750 LS 42.20 26.20 68.40
  Core-drill and mount A/C drain P1@.150 LF 3.17 5.44 8.61
  Mount air mover in air handler duct P1@.120 Ea — 4.35 4.35
  Connect ductwork mains to manifold P1@4.50 Ea 160.00 163.00 323.00
  Cut and braze copper A/C coil piping and run condensate drain P1@4.00 Ea 8.20 145.00 153.20
  Mount high-velocity ductwork and silencer tubing P1@0.10 LF 18.50 3.62 22.12
  Digital zone control thermostat, manual BE@.750 Ea 132.00 29.90 161.90
  Digital master heat/cool controller unit with auto change-over BE@.750 Ea 317.00 29.90 346.90
  Wiring of controls, typical BE@3.00 Ea 1.60 120.00 121.60
  Calibration and test BE@2.00 Ea — 79.70 79.70
Electric Heating Labor includes installation and connecting only. Add the cost of wiring from the Commercial and Industrial section of this manual.
Electric baseboard heaters, convection type, surface mounted, 20 gauge steel. Labor includes installation and connecting only. Add the cost of wiring. 7" high, 3-1/4" deep, 3.41 Btu/hr/watt, 240 volt. Low or medium density. [view picture]
        2'6" long, 500 watt (1,700 Btu) BE@1.70 Ea 31.90 67.70 99.60
        3'0" long, 750 watt (2,225 Btu) BE@1.81 Ea 37.50 72.10 109.60
        4'0" long, 1,000 watt (3,400 Btu) BE@1.81 Ea 42.80 72.10 114.90
        6'0" long, 1,500 watt (5,100 Btu) BE@1.89 Ea 57.70 75.30 133.00
        8'0" long, 2,000 watt (6,800 Btu) BE@2.04 Ea 64.30 81.30 145.60
    Add for integral thermostat BE@.094 Ea 21.10 3.74 24.84
    Add for wall mounted thermostat BE@1.62 Ea 28.40 64.50 92.90
Fan-forced electric wall heaters, 12-3/4" x 6" rough opening. Add for 240 volt wiring and thermostat. [view picture]
        700/900/1600 watt, 50 CFM BE@.650 Ea 147.00 25.90 172.90
        500 watt, 6.25 amp, 5118 Btu, 83 CFM BE@.650 Ea 138.00 25.90 163.90
    1,000 watt, 4.17 amp, 3412 Btu, 83 CFM BE@.650 Ea 138.00 25.90 163.90
    2,000 watt, 8.33 amp, 6824 Btu, 60 CFM BE@.650 Ea 169.00 25.90 194.90
    2,000 watt, 8.33 amp, 6824 Btu, 83 CFM BE@.650 Ea 118.00 25.90 143.90
    3,000 watt,12.5 amp, 12,236 Btu, 65 CFM BE@.650 Ea 162.00 25.90 187.90
    Double pole thermostat, 120 or 240 volt BE@.440 Ea 27.10 17.50 44.60
Surface mounted 1" thick radiant ceiling panels. 120/208/240/277 volts AC. [view picture]
          250 watts, 24" x 24" BE@.850 Ea 171.00 33.90 204.90
          310 watts, 24" x 24" BE@.850 Ea 178.00 33.90 211.90
          375 watts, 24" x 24" BE@.850 Ea 190.00 33.90 223.90
          625 watts, 24" x 48" BE@1.11 Ea 422.00 44.20 466.20
          750 watts, 24" x 48" BE@1.31 Ea 444.00 52.20 496.20
    Add for radiant line voltage wall thermostat BE@.450 Ea 65.10 17.90 83.00
    Add for motion sensing setback thermostat BE@.450 Ea 78.50 17.90 96.40
Floor units, drop-in type, 14" long x 7-1/4" wide, includes fan motor assembly, housing and grille
    120 volts, 375 or 750 watts BE@1.76 Ea 325.00 70.10 395.10
    277 volts, 750 watts BE@1.76 Ea 400.00 70.10 470.10
    Add for wall thermostat kit BE@1.62 Ea 76.50 64.50 141.00
    Add for concrete accessory kit and housing — LS 24.30 — 24.30
Infrared quartz tube heaters, indoor or outdoor, chromed guard, polished aluminum reflector. Includes modulating control.
    3.2 KW, 24" long, 240 volts BE@4.14 Ea 376.00 165.00 541.00
    5 KW, 33" long, 240 volts BE@4.14 Ea 496.00 165.00 661.00

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