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Unico or Spacepak?

Adding AC soon to a hydronic-ly heated house.

If we go the hi-velocity route versus conventional...what are my deciding factors Unico versus SpacePak?

Comments

  • Steve MinnichSteve Minnich Posts: 2,468Member
    You can’t go wrong with either. They’re both very good and I’ve installed many of each over the years. I’d suggest going with the one your contractor is most comfortable with.
    PHC News Columnist
    Minnich Hydronic System Design & Consultants
  • mikeg2015mikeg2015 Posts: 989Member
    edited November 3
    Property design and installation is EVERYTHING on these. They are not very forgiving like conventional ducted system. Done wrong, they are noisy, leaky power hogs. Hydronic will be a little more forgiving, but need to make sure water temps, design flow rates, airflow rates are all checked so you’ll have enough capacity.

    Most of these have water/air temp limits since the coil is before the blower motor.

    I had a Unico installed at my house poorly before I was in the trades. There’s leaks, it’s noisy and power use is only a little better than when I was running 4 window units upstairs. 3 ton outdoor unit and delivered capacity is probably not better than a 2 ton conventional... though it dehumidifies better, but not that much better since all the air leaks push humidity from the attic into the house anyway.

    Bottom line for me, old houses are quiet with thick walls, and my conventional system downstairs is silent, and my Unico upstairs is only silent below 60% of high stage cooling airflow speed. They already extended the take offs which quieted it down some. It just needed a LOT more outlets.

    Spacepack seem more common and easier to get parts. Took over a week to get a failed TXV replaced right after it was installed.

    1) Use all metal ductwork for the plenum, and lots of mastic, R8 insulation sealed completely.
    2) err toward using more outlets to reduce noise.
    3) Verify actual heating capacity using mfg charts.
  • clammyclammy Posts: 2,325Member
    Unico perimeter loop 8 outlets per ton and use spiral duct and fittings all joints sealed and externally wrapped w r 8 fiberglass insulation . Seperate returns for 2 story homes and always a space guard hepa filter just a few basics to look for including a getting better then the builders grade Outdoor unit .they are not a inexpensive system but in any case I ve used them i there was no other ways aside from massive renovation work . I come across a lot which are installed below sub par they work there loud ,I would say I see more bad spakepak system then unico and more space pack then unico installs who knows why there both handled locally .peace and good luck clammy
    R.A. Calmbacher L.L.C. HVAC
    NJ Master HVAC Lic.
    Mahwah, NJ
    Specializing in steam and hydronic heating
  • John Mills_5John Mills_5 Posts: 926Member
    Unico support is amazing. I've called Space Pak and they didn't answer. Probably not a biggie for the homeowner but something to know.
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