This comes to us courtesy of Carol Noel (Aloha Hoya). Many thanks Carol for giving me permission to re-print this valuable information.
The following is from notes I took while talking with David Liddle about growth habits of some hoyas. This is not meant to be a "how you should grow your hoyas" but how the hoyas grow in the wild. Remember that hoyas basically grow where and how they can grab a foothold in nature: from crotches of trees where leaf litter accumulates, in a clump of moss on a branch etc. These growing condition are how David has found the hoyas he has collected.
H. albiflora - 2 monsoon region. Moisture necessary, moderate indirect light.
H. aldrichii - Grows slightly dry and warm.
H. archboldiana - Lowland trees and shrubs, high indirect light. Let it grow dryer in winter.
H. bella - From moist highland rain forest...constant moisture. Cool
H. bhutanica - Grows dryer, moderate light.
H. bordenii - Grows shady, moist, cool dim to moderate light.
H. callistophylla - From dark, deep shade. Grows wet.
H. campanulata - Found at edge of forest. High humidity and light.
H. caudate - High humidity and air movement.
H. cembra - Likes light and grows dryish.
H. citrina - Double monsoon area. From mangroves - moisture. Understory plant.
H. curtisi - Moist. Deep shade. Don't let it get dry.
H. davidcummingii - Found near Lake Bulisan in moderate shade.
H. dennisii - Deep shade.
H. deykei - Double monsoon area. Likes warm and shady, hates cold and wet.
H. doliocosparte - Found in a cleared forest under a log.
H. engleriana - Found at high altitude where it got fog at night during the dry season. Getting dry would probably kill the plant.
H. erythrina - Grows in understory with little light and lots of air movement.
H. erythrostemma - Found beside a river, shady, moist, good air movement.
H. flavida - Cool is OK.
H. fusca - Likes deep shade, moisture.
H. glabra - A wet forest climber, not full sun.
H. halophila - Found in mangrove swamps. Shade. Humidity.
H. hypolasia - High humidity. Air movement is the key.
H. inconspicua - Coastal. + light.
H. kanyakumariana - would not like to grow wet.
H. kerrii - grow open and dry.
H. latifolia - Shade. Understory plant.
H. linearis - Grows dryish and cool.
H. lobbii IML 1161 - Found along streams, shady, humid.
H. loheri - Grows dryish and shady.
H. macgillivrayi - Single monsoon area. Moderate light, grow dryish in winter.
H. magnifica - Found in high altitude, in shade and lots of water.
H. megalaster - Found in deep shade, in the understory in the rainforest. High humidity.
H. mindorensis - Shade grower.
H. naumanii - Found in the understory, moist, low light.
H. nummularoides - Grows dryish.
H. odetteae - Grows moist but not wet in shade.
H. obtusifolia - From mountain areas + moisture + humidity
H. pachyclada - Grows dryish. Capable of withstanding long periods of drought.
H. padangensis - Grows dryish.
H. parviflora - Less light - grow like H. carnosa.
H. purpureo-fusca - Grows in midstory of forest, dim light + humidity.
H. pusilla - Dim light. + water + humidity.
H. sariae - From shady jungle.
H. scortechinii - Grow moist.
H. sp. 1280 aff. H. kentiana - Not too wet.
H. subglabra - Moderate to cool. Moderate light. Found in high altitude growing in the grass in an aging moss forest.
H. revoluta - Found at beach edge. Warm and lots of water.
H. rigida - Found in mangrove swamp with high humidity and moderate to bright light.
H. thomsonii - Found on rocks next to a stream. Grow cool, deep shade, high humidity. Air flow.
H. waymaniae - Found in understory, deep shade.