Uztikau idomu pastebejima
http://www.archiexpo.com/prod/airpac-international/high-temperature-air-water-aerothermal-heat-pumps-311-272865.html
A two-stage system : the R410A first stage operates alone when outdoor 
temperatures are mild ; a "booster" stage using R134A completes the 
capacity and increase the temperature for the coldest periods of winter. 
So you get an outlet temperature till 70°C even for temperatures as low 
as -15°C outside. The R134A "booster" stage operates only when it is 
needed, allowing to achieve real savings for maximum comfort.
The COP is one of the best of the market for this category of products : 
up to 4.02.
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Rasoma, kad siltu periodu naudoja R410A freona, o saltu periodu 
persijungia i R134A freona. Is sio aprasymo atrodo taip, kad pakeitus 
pigiame kondicionieriuje freona i R134A, kondicionierius darbine 
temperatura pazemetu nuo 5 iki 15 laipsniu salcio

Ta pacia proga pridedu dar viena idomu oras-(beveik)vanduo silumos 
siurbli  Mitsubishi Electric orinis SS su silumokaiciu, pajungiamu 
tiesiai prie grindinio sildymo http://www.ecodan.lt/zubadan
"Gamintojas garantuoja sistemos darbą iki minus 25°C lauko temperatūros, 
o faktinė šiluminė galia esant lauko temperatūrai minus 15°C atitinka 
nominalią šilumos siurblio galią."