Here is a list of how hot the maps are. Hope it's useful
The number is the heat sink efficiency, so the higher the number the cooler your mech will run. I assume that its a direct correlation between the number and the amount of heatsinks a mech has (dont forget they have some built in). ie a mech with 12 heatsinks (counting internals) on Inner City (factor 1.0) builds up the same heat as a mech with 10 on River canyon (factor1.2).
Anyway here goes.
Alpine Pro 1.1
Arctic wasteland 1.15
Aspen 1.0
Avalon Pro 1.2
BigCity 1.0
BloodPit 0.95
BrokenSky 1.2
Cantina 1.5
Canyon 0.9
Carse Pro 0.95
CentralPark 1.0
Circus Maximus 0.8
ColdFire 1.2
Concourse 1.0
Crossover 1.0
Defiance Pro 1.0
Dustbowl 0.8
Equinox 1.2
Evergreen 1.0
Exford Pro 0.9
Fogbound 1.0
Frostbite 1.2
Gatorbait 1.0
GhostHighway 0.9
HalloranPro 1.1
Halthon 1.6
HesperusPro 1.0
Highlands 1.0
Hogsback 1.0
InnerCity 1.0
JungleJimi 1.15
Lakefront 1.0
Lakeside 1.0
lostCity2 1.2
Lunacy 1.7
Manorhouse 1.0
Mechworks 0.7
MektekArena 1.3
MineHQ 1.5
NB Arrowhead 1.0
NB Asteroid 1.4
NB Badlands 0.75
NB Battlefront 0.9
NB Beartrap 1.2
NB Cerabus 1.0
NB Divided 1.0
NB Dodana 1.2
NB Ephesus 1.0
NB Krakatau 0.9
NB Mannedorf 0.8
NB MaxThrottle 1.0
NB Plains 1.0
NB Riverside 1.0
NB Solardesert2 0.6
NB Tetsuhara 0.8
NB Warfortune 0.8
NovaOp 1.2
Oilspill 1.1
OrbitalDecay 1.4
PalaceGates 1.0
ParadisePro 0.95
PolarTundra 1.2
Resupply 1.0
Ridgerunner 1.1
RiverCanyon 1.2
RoyalGuardPro 1.1
Rubble 1.0
RubbleGiant 1.0
RuinedCity 0.95
SanddunesPro 0.8
Scrub 0.8
Shoreline 1.0
Snowbound 1.2
Snowbowl 1.2
Snowjob 1.2
Spaceport 0.9
Switchback 1.0
Thark 1.1
Timberline 1.0
Trails 1.1
TumbleweedPro 0.85
VBase 0.7
Warzone 1.0
Wetlands 1.0