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Originally Posted by alexshock
Much more noise (will I need earplugs like on a helicopter?)
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Not so extreme, plus much of the noise would come from a lower spot. Did you notice ambulances and police cars now feature the sirens behind the front grille instead of above the roof? That was done in order to decrease the likelihood of long-term hearing impairments for operators.
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Hotter in summer (A/C may consume much more which will have negative impact on FE)
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You could eventually resort to some thermal insulators which are lighter than the original trim. Those aluminium-sided insulator blankets, often used for roofing insulation, are quite common to see on JDM cars converted from RHD to LHD in countries such as Paraguay, sealing some gaps on the right-hand side of the firewall.
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Colder in winter. 
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Either those aluminium-sided blankets or some rubberized paint could do the trick to not make the interior so colder in winter.